DeVille, Eldorado, Seville 1999-2005

4.6L V8 VIN Y Auto 5

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Trouble Code: P1154



HO2S-21 (Bank 2 Sensor 1) Transition Time Ratio

Possible Causes:



Air leaks present in the exhaust manifold or the exhaust pipes
 
HO2S may be contaminated (due to improper fuel or silicone)
 
HO2S signal low reference circuit has high resistance
 
HO2S heater element has failed, or the heater circuit is open
 
PCM has failed
 

Trouble Code: P1189



Engine Oil Pressure Switch Circuit Malfunction

Possible Causes:



EOT switch circuit is open or the EOT switch ground circuit is open
 
Engine oil temperature switch is damaged or has failed
 
PCM has failed
 
TSB 87-65-24 contains a repair procedure for this code
 

Trouble Code: P1258



Engine Metal Over-Temperature Protection

Possible Causes:



Engine cooling system problem (test the cooling fan operation)
 
Engine coolant level is low or the mixture is not correct
 
ECT sensor is out-of-calibration or "skewed"
 

Trouble Code: P1320



ICM 4X Reference Circuit No Pulses (Intermittent)

Possible Causes:



Ignition control (4X) circuit is open, shorted to ground or to B+
 
Ignition module power circuit is open (test power from DS fuse)
 
Ignition module is damaged or has failed
 
PCM has failed
 
TSB 71-65-69 contains a repair procedure for this code
 

Trouble Code: P1323



ICM 24X Reference Circuit Low Frequency

Possible Causes:



Ignition control (24X) circuit is open, shorted to ground or to B+
 
Ignition control (24X) circuit is shorted to another module circuit
 
Ignition module or the PCM is damaged or has failed
 
TSB 71-65-69 contains a repair procedure for this code
 

Trouble Code: P1336



CKP Sensor System Variation Not Learned

Possible Causes:



Set the parking brake and block the drive wheels for safety.
 
Verify the hood is closed.
 
Read the trouble codes. If a code is set, refer to that code.
 
Start the engine. Allow engine temperature to reach at least 158ºF (70ºC). Then key off.
 
Select Crankshaft Position Variation Learn procedure on Scan Tool & start the vehicle.
 
Apply the brake pedal firmly and verify the selector is in Park.
 
Increase accelerator pedal position until fuel cutoff is reached at the test rpm (e.g., 5150). Quickly release the accelerator pedal after fuel cutoff is reached. The CKP system variation compensating values are learned when the engine speed (rpm) decreases back to idle speed and the procedure terminates.
 
Read the trouble codes and recheck for DTC P1336.
 
If DTC P1336 runs and passes, the CKP system variation "learn" procedure is complete. If not, look for other codes. If no codes are set, repeat the test procedure.
 

Trouble Code: P1350



Ignition Control (IC) Circuit Malfunction

Possible Causes:



Bypass circuit is open, shorted to ground or shorted to power
 
IC signal circuit is open, shorted to ground or shorted to power
 
IC module has failed
 

Trouble Code: P1359



Ignition Coil Group 1 Control Circuit Malfunction

Possible Causes:



IC control circuit for Coil Group 1 is open or shorted to power
 
ICM power or ground circuit is open or has high resistance
 
ICM is damaged or has failed
 
PCM has failed
 

Trouble Code: P1360



Ignition Coil Group 2 Control Circuit Malfunction

Possible Causes:



IC control circuit for Coil Group 2 is open or shorted to power
 
ICM power or ground circuit is open or has high resistance
 
ICM is damaged or has failed
 
PCM has failed
 

Trouble Code: P1370



IC Module 4X Reference Circuit Too Many Pulses

Possible Causes:



Battery charger connected to the vehicle with engine running
 
Fuel control 4X circuit is open or shorted (intermittent fault)
 
IC 24X signal wire routed close to Generator, spark plug wires or EMI/RFI interference
 
High power transmitters mounted to close (e.g., mobile radio)
 
IC module is damaged or has failed
 
TSB 71-65-69 contains a repair procedure for this code
 

Trouble Code: P1371



IC Module 4X Reference Circuit Too Few Pulses

Possible Causes:



Battery charger connected to the vehicle with engine running
 
Fuel control 4X circuit is open or shorted (intermittent fault)
 
IC 24X signal wire is routed to close to the Generator, spark plug wires or any other possible cause of EMI/RFI interference
 
High power transmitters mounted to close (e.g., mobile radio)
 
IC module is damaged or has failed
 
TSB 71-65-69 contains a repair procedure for this code
 

Trouble Code: P1372



Crankshaft Position Sensor A-B Correlation

Possible Causes:



CKP Sensor 'B' signal circuit is open, shorted to ground or shorted to system power (an intermittent fault may be present)
 
CKP Sensor 'B' is damaged or has failed (an intermittent fault)
 
ICM is damaged or has failed (an intermittent fault)
 

Trouble Code: P1375



IC Module 24X Reference Circuit High Input

Possible Causes:



CKP Sensor 'A' signal circuit is open or shorted to ground
 
Crank Sensor 'A' is damaged or has failed
 
Crank Sensor 'B' low circuit is shorted to CKP 'A' high circuit
 
Crank Sensor 'B' is damaged or has failed
 
IC module is damaged or has failed
 
PCM had failed
 

Trouble Code: P1376



IC Module Ignition Ground Circuit Malfunction

Possible Causes:



IC module ground circuit is open or has high resistance
 
IC module reference low circuit is open or has high resistance
 
IC module reference low circuit shorted to VREF or power (B+)
 
This code may set if the PCM is not installed properly (e.g., it is not grounded correctly)
 
IC module is damaged or has failed
 
TSB 71-65-69 contains a repair procedure for this code
 

Trouble Code: P1377



ICM CMP Pulse To 4X Reference Pulse Comparison

Possible Causes:



IC fuel control 4X signal circuit is open, shorted to ground or B+
 
CMP sensor signal circuit is open or has high resistance
 
CMP high or low reference circuit is open or high resistance
 
This code may set if all (4) camshafts are off by one tooth, 10 degrees before top dead center (driveability complaints exist)
 
IC module is damaged or has failed
 

Trouble Code: P1380



Misfire Detected, Rough Road Data Not Available

Possible Causes:



The presence of this code (P1380) indicates the ABS/TCS system detected a fault 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
 

Trouble Code: P1381



Misfire Detected, No Communication With The EBCM

Possible Causes:



Verify with a Scan Tool that the EBCM can transmit serial data on the Class 2 serial data circuit. Service the EBCM as needed before diagnosing a misfire because an actual engine misfire may or may not exist. An engine misfire may have occurred during a period when the EBCM could not communicate.
 
Refer to Diagnostic System Check for Antilock Brake System
 

Trouble Code: P1404



EGR Valve Closed Position Range/Performance

Possible Causes:



EGR sensor signal circuit is shorted to VREF or system voltage
 
EGR sensor VREF circuit is shorted to system power
 
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: P1415



Secondary Air Injection System (Bank 1) Malfunction

Possible Causes:



Air hoses disconnected, loose, kinked or failed (a burnt hose)
 
AIR pump is damaged or has failed (inspect air pump for water)
 
AIR system check valves and/or pipes are damaged or leaking
 
AIR check valve (in hose to vacuum bleed valve) stuck closed
 
PCM has failed
 

Trouble Code: P1416



Secondary Air Injection System (Bank 2) Malfunction

Possible Causes:



Air hoses disconnected, loose, kinked or failed (a burnt hose)
 
AIR pump is damaged or has failed (inspect air pump for water)
 
AIR system check valves and/or pipes are damaged or leaking
 
PCM has failed
 

Trouble Code: P1441



EVAP System Flow During Non-Purge

Possible Causes:



An improperly installed or damaged EVAP canister purge valve
 
A temporary blockage in the EVAP canister purge valve, purge pipe, or EVAP canister
 
FTP sensor is out-of-calibration, damaged or "skewed"
 
Purge solenoid valve is damaged or has failed
 
PCM has failed
 
TSB 71-65-26 contains a repair procedure for this code
 

Trouble Code: P1508



Idle Speed Low - IAC Control System Not Responding

Possible Causes:



Base engine problem causing a slow or unstable idle speed
 
Fuel system is too rich or too lean
 
IAC motor is damaged or has failed (it may be sticking)
 
Throttle body plate or bore contaminated with foreign material
 
Throttle body adjustment screw tampered with or damaged
 
Perform the IAC Reset procedure with the Scan Tool
 

Trouble Code: P1509



Idle Speed High - IAC System Not Responding

Possible Causes:



Base engine problem (engine vacuum leak or PCV valve leak)
 
Fuel system is too rich or too lean
 
IAC motor circuit open, shorted to ground or shorted to power
 
Throttle body adjustment screw tampered with or damaged
 
Perform the IAC Reset procedure with the Scan Tool
 

Trouble Code: P1520



Transmission Range Switch Circuit Malfunction

Possible Causes:



One or more TR switch circuits is open or shorted to ground
 
One or more TR switch circuits is shorted to VREF or B+
 
One or more TR switch circuits is shorted together
 
TR switch is out of adjustment, damaged or it has failed
 
PCM has failed
 

Trouble Code: P1527



Transmission Range To Pressure Switch Correlation

Possible Causes:



TR switch signal circuit is open or shorted to ground
 
TR switch ground circuit is open
 
One or more transmission pressure switches have failed
 
PCM has failed
 

Trouble Code: P1545



Air Conditioning Clutch Relay Control Circuit Malfunction

Possible Causes:



A/C clutch relay control circuit is open, shorted to ground or shorted to system power
 
A/C clutch relay power circuit is open (test the AC CLU fuse)
 
A/C clutch relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P1554



Cruise Control Feedback 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: P1560



Transaxle Not In Drive - Cruise Control Disabled

Possible Causes:



Review proper procedures to use to verify the shift lever is not placed in Neutral with Cruise Control "on" with the customer.
 

Trouble Code: P1564



Vehicle Acceleration Too High - Cruise Control Disabled

Possible Causes:



This code sets after a sudden rate of increase in vehicle speed occurs (i.e., vehicle speed sensing problem or traveling on icy roads) while the cruise is engaged, so it is necessary to check with the customer to verify the conditions present when it set.
 

Trouble Code: P1566



Engine Speed Too High - Cruise Control Disabled

Possible Causes:



Verify that there are not ABS/TCM trouble codes set
 
Verify that there are no TCM related trouble codes set
 
Discuss with the customer what conditions were present when this trouble code set so that it will not reoccur.
 

Trouble Code: P1567



Active Braking Control Active - Cruise Control Disabled

Possible Causes:



C/C brake switch is damaged or has failed
 
C/C set switch circuit is open or shorted to ground
 
C/C resume switch circuit is open or shorted to ground
 
C/C switch assembly is damaged or has failed
 
PCM has failed
 

Trouble Code: P1570



Traction Control Active - Cruise Control Disabled

Possible Causes:



Verify that there are no ABS/TCS trouble codes in memory
 
This trouble code is usually caused by conditions that cause traction control to activate during cruise control. Check with the customer to verify the conditions present when the code set.
 

Trouble Code: P1571



Traction Control System - PWM Circuit No Frequency

Possible Causes:



TCS desired torque circuit is open or shorted to ground
 
TCS desired torque circuit is shorted to system power (B+)
 
EBCM has failed
 
PCM has failed
 

Trouble Code: P1574



Stoplamp Switch Circuit Malfunction

Possible Causes:



Refer to Diagnostic Circuit Check for Antilock Brake Systems
 

Trouble Code: P1575



Extended Travel Brake Switch Circuit Malfunction

Possible Causes:



Brake switch circuit is open, shorted to ground or shorted to B+
 
Brake switch power circuit is open (test the IGN1 fuse)
 
Brake switch is out-of-adjustment, damaged or has failed
 
EBTCM has failed
 
TSB 01-06-03-009 contains a repair procedure for this code
 

Trouble Code: P1585



Cruise Control Inhibit Output Circuit Malfunction

Possible Causes:



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

Trouble Code: P1599



Engine Stall Or Near Stall Detected

Possible Causes:



Many conditions can cause stalling - use snapshot taken from DTC P1599. Compare the values when the code set to Typical Scan Data values. Look for conditions that could cause a stall.
 

Trouble Code: P1602



Loss Of EBTCM Serial Data

Possible Causes:



Check the serial data circuit for a poor connection at the PCM
 
Perform the EBTCM Diagnostic Circuit Check
 
Perform the Powertrain Onboard Diagnostic System Check
 

Trouble Code: P1603



Loss Of Sensing Diagnostic Mode Data

Possible Causes:



Check the serial data circuit for a poor connection at the SIR
 
Perform the SIR System Check
 
Perform the Powertrain Onboard Diagnostic System Check
 

Trouble Code: P1604



Loss Of IPC Serial Data

Possible Causes:



Check the serial data circuit for a poor connection at the IPC
 
Perform the IPC System Check
 
Perform the Powertrain Onboard Diagnostic System Check
 

 
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