ParkAvenue 1997-1999

3.8L V6 VIN K Auto 4

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Trouble Code: P1361



ICM Ignition Control Circuit Low Input

Possible Causes:



IC timing control circuit is shorted to ground or shorted to power
 
IC module has failed
 
PCM has failed
 

Trouble Code: P1362



Ignition Bypass Circuit Low Voltage

Possible Causes:

Check for the following conditions:



Poor connection at the PCM. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
 
Damaged harness. Inspect the wiring harness for damage. If the harness appears to be OK, disconnect the ICM, turn the ignition on and observe a digital multimeter connected between the IC circuit and B+ while moving connectors and wiring harnesses related to the ICM. A change in voltage will indicate the location of the malfunction.
 

Trouble Code: P1374



IC Module 3X Reference Circuit Malfunction

Possible Causes:



IC 3X signal wire is routed to close to the Generator, spark plug wires or any other possible cause of EMI/RFI interference
 
IC 3X signal circuit is open, shorted to ground or shorted to B+
 
IC module is damaged or has failed
 
PCM has failed
 
TSB 99-06-04-45 contains a repair procedure for this code
 

Trouble Code: P1380



Misfire Detected, Rough Road Data Unusable

Possible Causes:



The presence of this code (P1380) indicates the ABS/TCS system detected a malfunction that would not allow the EBTCM to transmit the correct rough road data to the PCM
 
Refer to Diagnostic System Check for Antilock Brake System
 
Refer to Diagnostic System Check for the Engine Controls
 

Trouble Code: P1381



Misfire Detected - No Communication With The EBCM

Possible Causes:



Service the ABS before diagnosing a misfire because an actual engine misfire may or may not exist. Also, an actual engine misfire may have occurred during a period of ABS malfunction.
 
Determine if the vehicle was driven on a rough road, and the ABS could not detect this due to a malfunction. The PCM may interpret variations in crankshaft speed caused by the rough road as a misfire without an actual engine misfire present.
 
Refer to the Diagnostic System Check for ABS and the PCM
 

Trouble Code: P1404



EGR Valve Closed Position Signal Range/Performance

Possible Causes:



EGR sensor signal circuit is shorted to VREF
 
EGR sensor ground circuit is open or has high resistance
 
EGR sensor is damaged or has failed (sensor/solenoid unit)
 
EGR valve pintle or valve seat contains carbon deposits
 
PCM has failed
 

Trouble Code: P1406



EGR Valve Pintle Position Circuit Malfunction

Possible Causes:



EGR solenoid control circuit is open, shorted to ground or to B+
 
EGR solenoid power circuit is open (check the IGNFD 5A fuse)
 
EGR solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P1441



EVAP System Flow During Non-Purge

Possible Causes:



EVAP purge valve, purge pipe, or the charcoal canister has a temporary blockage (this fault could cause an intermittent fault)
 
FTP sensor is out-of-calibration, damaged or it is skewed
 
EVAP purge solenoid valve is damaged or has failed
 
PCM has failed
 
TSB 00-06-04-022 contains a repair procedure for this code
 

Trouble Code: P1546



A/C Clutch Feedback Circuit Low Input

Possible Causes:



A/C clutch status line is open or shorted to ground
 
A/C clutch relay is damaged or has failed (contains not closing)
 
A/C clutch relay power circuit is open (test the HVAC fuse)
 
PCM has failed
 

Trouble Code: P1554



Cruise Control Feedback Circuit

Possible Causes:

Check for the following conditions:



Poor connection at the PCM. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
 
Damaged harness. Inspect the wiring harness for damage. If the harness appears to be OK, observe the Cruise Status display on the scan tool while moving connectors and wiring harnesses related to the Stepper Motor Cruise Control module. A change in the display will indicate the location of the malfunction.
 

Trouble Code: P1554



Cruise Control Status Circuit Malfunction

Possible Causes:



Cruise control inhibit circuit is open or shorted to ground
 
SMCC II cruise control module is damaged or has failed
 
PCM has failed
 

Trouble Code: P1571



Traction Control Torque Request Circuit Malfunction

Possible Causes:



T/C desired torque circuit is open or shorted to ground
 
T/C desired torque circuit is shorted to system power (B+)
 
EBTCM has failed
 
PCM has failed
 

Trouble Code: P1585



Cruise Control Inhibit Output Circuit Malfunction

Possible Causes:



Cruise control inhibit circuit is shorted to system voltage
 
Cruise control module power circuit is open (test CR CNT fuse)
 
Cruise control stepper motor power circuit is shorted to ground
 
Cruise control module is damaged or has failed
 
PCM has failed
 

Trouble Code: P1602



Lost Communications with Brake/Traction Control (EBTCM) System

Possible Causes:

For complete serial data line schematics, refer to Cell 20: Engine Controls - PCM MIL and Data Link Connector (DLC) . An intermittent may be caused by a poor connection, rubbed through wire insulation or a wire broken inside the insulation. Check for the following conditions:



Intermittent short circuit on the serial data circuit. Refer to Cell 20: Engine Controls - PCM MIL and Data Link Connector (DLC) and check all related wiring for an intermittent short to ground or short to voltage.
 
Poor connection. Inspect the PCM and the affected control module harness and related connectors for improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
 
Damaged harness. Inspect the wiring harness for damage. Check for an intermittent short or open circuit in the wiring harnesses related to the affected control module, including the ignition, battery feed, ground, and serial data circuits. Refer to Wiring Repairs .
 

Trouble Code: P1604



Lost Communications with Driver Information and Displays Control (IPC) System

Possible Causes:

An intermittent may be caused by a poor connection, rubbed through wire insulation or a wire broken inside the insulation. Check for the following conditions:



Intermittent short circuit on the serial data circuit. Refer to Cell 20: Engine Controls - PCM MIL and Data Link Connector (DLC) and check all related wiring for an intermittent short to ground or short to voltage.
 
Poor connection. Inspect the PCM and the affected control module harness and related connectors for improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
 
Damaged harness. Inspect the wiring harness for damage. Check for an intermittent short or open circuit in the wiring harnesses related to the affected control module, including the ignition positive voltage, battery positive voltage, ground, and serial data circuits. Refer to Wiring Repairs .
 

Trouble Code: P1610



Lost Communications with Body Multiple Control (BCM) System

Possible Causes:

For complete serial data line schematics, refer to Cell 20: Engine Controls - PCM MIL and Data Link Connector (DLC) . An intermittent may be caused by a poor connection, rubbed through wire insulation or a wire broken inside the insulation. Check for the following conditions:



Intermittent short circuit on the serial data circuit. Refer to Cell 20: Engine Controls - PCM MIL and Data Link Connector (DLC) and check all related wiring for an intermittent short to ground or short to voltage.
 
Poor connection. Inspect the PCM and the affected control module harness and related connectors for improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
 
Damaged harness. Inspect the wiring harness for damage. Check for an intermittent short or open circuit in the wiring harnesses related to the affected control module, including the ignition, battery feed, ground, and serial data circuits. Refer to Wiring Repairs .
 

Trouble Code: P1626



Theft Deterrent System Fuel Enable Circuit Malfunction

Possible Causes:



Perform the Onboard Diagnostic System Check
 
If the PCM needs replacing, it must be reprogrammed
 
TSB 02-08-56-002 contains a repair procedure for this code
 

Trouble Code: P1629



Theft Deterrent Signal Not Present, Engine Cranking

Possible Causes:



Perform the Onboard Diagnostic System Check
 
Refer to the diagnostics for the Theft Deterrent System
 
If the PCM needs replacing, it must be reprogrammed
 
TSB 02-08-56-002 contains a repair procedure for this code
 

Trouble Code: P1630



Theft Deterrent Learn Mode Active

Possible Causes:



Perform the Onboard Diagnostic System Check
 
Refer to the diagnostics for the Theft Deterrent System
 
If the PCM needs replacing, it must be reprogrammed
 

Trouble Code: P1631



Theft Deterrent Enable Signal Not Correct

Possible Causes:



This code indicates that the VTD password that the PCM has learned does not agree with the password being received from the theft deterrent system. This condition can occur if an incorrect key is being used when attempting to start the vehicle or if the Theft Deterrent Module has been replaced and the PCM password learn function has not been enabled.
 
Refer to Programming the Theft Deterrent System
 
Perform the Powertrain Onboard Diagnostic System Check
 

Trouble Code: P1635



5-Volt Reference 'A' Circuit Malfunction

Possible Causes:



5v VREF circuit is shorted to sensor ground or chassis ground
 
5v VREF circuit, MAP or FTP sensor circuit is shorted to (B+)
 
5v VREF circuit shorted to EGR sensor High signal circuit
 
EGR solenoid valve (and sensor) is damaged or has failed
 
PCM has failed
 

Trouble Code: P1639



5-Volt Reference 'B' Circuit Malfunction

Possible Causes:



A/C refrigerant pressure sensor VREF circuit is open, shorted to ground or shorted to system power
 
A/C refrigerant pressure sensor is damaged or PCM has failed
 
TSB 61-65-61 contains a repair procedure for this code
 

Trouble Code: P1640



MIL Control Circuit Malfunction

Possible Causes:



MIL control circuit is open, shorted to ground or to power (B+)
 
MIL (lamp) is damaged or failed (open circuit or missing)
 
MIL power circuit is open (check Fuse 39 in U/H fuse block)
 
PCM has failed
 

Trouble Code: P1641



A/C Fan Relay Control Circuit Malfunction

Possible Causes:



A/C relay circuit is open, shorted to ground or to power (B+)
 
A/C relay is damaged or failed (open circuit or missing)
 
A/C relay power circuit is open (test the A/C BFC fuse)
 
PCM has failed
 

Trouble Code: P1646



Boost Control Solenoid Circuit Malfunctions

Possible Causes:



Boost control solenoid circuit is open or shorted to ground
 
Boost control solenoid circuit is shorted to power
 
Boost control solenoid power circuit is open (test AC CLU fuse)
 
Boost control solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P1651



Fan 1 Control Relay Control Circuit Malfunction

Possible Causes:



Cooling fan relay 1 control circuit is open or shorted to ground
 
Cooling fan relay 1 control circuit is shorted to system power
 
Cooling fan relay 1 power circuit is open (test COOL FAN1 fuse or the MAXI fuse)
 
Cooling fan relay 1 is damaged or has failed
 
PCM has failed
 

Trouble Code: P1652



Cooling Fan Relay 2 Control Circuit

Possible Causes:

Check for the following conditions:



Poor connection at the PCM. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
 
Damaged harness. Inspect the wiring harness for damage. If the harness appears to be OK, disconnect the PCM, turn the ignition ON and observe a digital multimeter connected between the Fan 2 control circuit and ground at the PCM harness connector while moving connectors and wiring harnesses related to the series/parallel fan relay and the high speed fan relay. A change in voltage will indicate the location of the malfunction.
 

Trouble Code: P1653



TCS Torque Control Circuit Malfunction

Possible Causes:



Torque control circuit is open, shorted to ground or to B+
 
EBTCM has failed
 
PCM has failed
 

Trouble Code: P1654



A/C Relay Control Circuit Malfunction

Possible Causes:



A/C relay control circuit is open, shorted to ground or to B+
 
A/C relay power circuit is open (check the HVAC RLY fuse)
 
A/C relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P1655



EVAP Purge Solenoid Control Circuit Malfunction

Possible Causes:



EVAP solenoid control circuit is open, shorted to ground or shorted to power (B+)
 
EVAP solenoid power circuit is open (check MISC ENG fuse)
 
EVAP solenoid is damaged or has failed
 
PCM has failed
 
TSB 61-65-41 contains a repair procedure for this code
 

Trouble Code: P1662



Cruise Control Inhibit Control Circuit Malfunction

Possible Causes:



Cruise control inhibit circuit is open, shorted to ground or to B+
 
Cruise control module has failed
 
PCM has failed
 

Trouble Code: P1665



EVAP Vent Solenoid Control Circuit Malfunction

Possible Causes:



Vent solenoid control circuit is open, shorted to ground or to system power
 
Vent solenoid power circuit is open (test the ENG EMISS fuse)
 
EVAP vent solenoid is damaged or has failed
 
PCM has failed
 
TSB 71-65-66 contains a repair procedure for this code
 

Trouble Code: P1667



Fuel Pump Speed Output Circuit

Possible Causes:

Check for the following conditions:



Poor connection at the PCM or Fuel Pump Control Module. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
 
Damaged harness. Inspect the wiring harness for damage.
 
If the harness appears to be OK, disconnect the PCM, turn the ignition ON and observe a digital Multimeter connected between the Fuel Pump Speed Control PWM circuit and ground at the PCM harness connector while moving connectors and wiring harnesses related to the Fuel Pump Control Module. A change in voltage will indicate the location of the malfunction.
 

Trouble Code: P1671



Malfunction Indicator Lamp (MIL) Control Circuit

Possible Causes:

Check for the following conditions:



Poor connection at the PCM. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
 
Damaged harness. Inspect the wiring harness for damage. If the harness appears to be OK, disconnect the PCM, turn the ignition ON and observe a digital multimeter connected between the MIL control circuit and ground at the PCM harness connector while moving connectors and wiring harnesses related to the MIL. A change in voltage will indicate the location of the malfunction.
 

Trouble Code: P1675



EVAP Vent Solenoid Control Circuit Malfunction

Possible Causes:



Vent solenoid control circuit is open, shorted to ground or shorted to power (B+)
 
Vent solenoid power circuit is open (check the IGN1 fuse)
 
Vent solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P1676



Evaporative Emission (EVAP) Purge Solenoid Control Circuit

Possible Causes:

Check for the following conditions:



Poor connection at the PCM. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
 
Damaged harness.
 
Inspect the wiring harness for damage. If the harness appears to be OK, disconnect the PCM, turn the ignition ON and observe a voltmeter connected between the EVAP purge solenoid control circuit and ground at the PCM harness connector while moving connectors and wiring harnesses related to the EVAP purge solenoid. A change in voltage will indicate the location of the malfunction.
 

Trouble Code: P1689



Traction Control Delivered Torque Output Circuit

Possible Causes:

Check for the following conditions:



Poor connection at the PCM. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
 
Damaged harness. Inspect the wiring harness for damage.
 
If the harness appears to be OK, disconnect the PCM, turn the ignition ON and observe a digital multimeter connected between the Traction Control Delivered Torque control circuit and ground at the PCM harness connector while moving connectors and wiring harnesses related to the EBTCM. A change in voltage will indicate the location of the malfunction.
 

Trouble Code: P1810



Transmission Pressure Switch Manifold Circuit Malfunction

Possible Causes:



TFP valve position switch signal circuit is open or grounded
 
TFP valve position switch circuit shorted to another signal
 
TFP valve position switch is damaged or has failed
 
PCM has failed
 

Trouble Code: P1810



TFP Valve Position Switch Assembly (4T65-E)

Possible Causes:



Inspect the transmission linkage from the gear select lever to the manual valve for proper adjustment
 
TFP valve position switch signal circuit is open or grounded
 
TFP valve position switch circuit shorted to another signal
 
TFP valve position switch is damaged or has failed
 
PCM has failed
 

Trouble Code: P1811



Maximum Adaptive & Long Term Shift (4T65-E)

Possible Causes:



Ask customer about overloading vehicle, exceeding trailer-towing limit, or towing in O/D
 
ATF level is low, or the fluid is contaminated or burnt
 
1-2 accumulator piston seals rolled or damaged
 
1-2 accumulator piston and pin missing, binding or damaged
 
Forward servo assembly damaged or misassembled
 
Oil pump assembly damaged or missing components
 
Spacer plate and gaskets damaged or misassembled
 
Driven sprocket support seals damaged or missing
 
2nd clutch piston and seal assembly binding or damaged
 
2nd clutch fiber and steel plates misassembled or damaged
 
Second clutch spring assembly damaged or misassembled
 
Forward band burned, damaged or misassembled
 
1-2 support roller clutch assembly damaged or misassembled
 

 
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