ION, L-Series, S-Series 1999-2005

1.9L I4 VIN 8 Auto 5

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Trouble Code: P1627



PCM-EC Analog To Digital Converter Error

Possible Causes:



Record any related trouble codes in memory
 
Replace and reprogram the PCM
 
Perform the Security System (Passlock) Relearn Procedure
 

Trouble Code: P1628



PCM Engine Coolant Temperature Pullup Resistor Error

Possible Causes:



Record any related trouble codes in memory
 
Replace and reprogram the PCM
 
Perform the Security System (Passlock) Relearn Procedure
 

Trouble Code: P1635



PCM 5-Volt Reference Circuit Malfunction

Possible Causes:



If DTC P0562, P0563 and P0711 are set, check for a short to ground on the 5v Reference circuit.
 
If DTC P0561, P0562 and P0711 are set, check for a short to system power on the 5v Reference circuit.
 
Try disconnecting the sensors one at a time to find the fault TSB 00-08-45-004A contains a repair procedure for this code
 

Trouble Code: P1639



PCM Analog To Digital Converter Error

Possible Causes:



Record any related trouble codes in memory
 
Replace the PCM and program the new PCM
 
Perform the Security System (Passlock) Relearn Procedure
 

Trouble Code: P1640



Output Driver Module 'A' Circuit Malfunction

Possible Causes:



A/C relay control circuit is open, shorted to ground or to B+
 
CFAN relay control circuit is open, shorted to ground or to B+
 
MIL (lamp) control circuit is open, shorted to ground or to B+
 
Upshift (lamp) control circuit is open, shorted to ground or B+
 
Power circuit is open to one of the devices (test the IGN 3 fuse)
 
One of these devices is damaged or it has failed
 
PCM has failed
 

Trouble Code: P1641



Output Driver Module 'A' Circuit Malfunction

Possible Causes:



A/C relay control circuit is open, shorted to ground or to B+
 
CFAN relay control circuit is open, shorted to ground or to B+
 
MIL (lamp) control circuit is open, shorted to ground or to B+
 
Upshift (lamp) control circuit is open, shorted to ground or B+
 
Power circuit is open to one of these devices (check the fuse)
 
One of these devices is damaged or it has failed
 
PCM has failed
 

Trouble Code: P1650



Output Driver Module 'B' Circuit Malfunction

Possible Causes:



A/C relay control circuit is open, shorted to ground or to B+
 
CFAN relay control circuit is open, shorted to ground or to B+
 
MIL (lamp) control circuit is open, shorted to ground or to B+
 
Upshift (lamp) control circuit is open, shorted to ground or B+
 
Power circuit is open to one of these devices (check the fuse)
 
One of these devices has failed or the PCM has failed
 

Trouble Code: P1660



PCM Generator Field Driven Device Error

Possible Causes:



Record any related trouble codes in memory
 
Replace the PCM and program the new PCM
 
Perform the Security System (Passlock) Relearn Procedure
 

Trouble Code: P1670



Output Driver Module 'C' Circuit Malfunction

Possible Causes:



AIR relay control circuit is open, shorted to ground or to B+
 
AIR solenoid control circuit is open, shorted to ground or to B+
 
AIR relay or solenoid power circuit is open (test the EGR fuse)
 
AIR relay or solenoid has failed, or the PCM has failed
 

Trouble Code: P1671



Output Driver Module 'C' Circuit Malfunction

Possible Causes:



AIR relay control circuit is open, shorted to ground or to B+
 
AIR solenoid control circuit is open, shorted to ground or to B+
 
AIR relay or solenoid power circuit is open (test the EGR fuse)
 
AIR relay or solenoid has failed, or the PCM has failed
 

Trouble Code: P1691



Coolant Gauge Circuit Malfunction

Possible Causes:



Coolant temperature gauge control circuit is open, shorted to ground or shorted to system power (B+)
 
PCM has failed
 

Trouble Code: P1693



Tachometer Circuit Malfunction

Possible Causes:



Tachometer control circuit is open, shorted to ground
 
Tachometer control circuit is shorted to system power (B+)
 
Tachometer power circuit is open (check the IGN 10A fuse)
 
PCM has failed
 

Trouble Code: P1695



Remote Keyless Entry Circuit Low Input

Possible Causes:



Remote keyless entry circuit is open, shorted to ground or shorted to system power (B+)
 
RKE module is damaged or it has failed (test power to RKE)
 
PCM has failed
 

Trouble Code: P1696



Remote Keyless Entry Circuit High Input

Possible Causes:



Remote keyless entry circuit is shorted to system power (B+)
 
RKE module is damaged or it has failed (test power to RKE)
 
PCM has failed
 

Trouble Code: U1000



Class 2 Data Link Malfunction - ID Not Learned

Possible Causes:



Check for a loose connection at the BCM, PCM or the SDM
 
If only one other U-Type code is set, diagnose that DTC first
 
If 2 or more U-Type codes are set, refer to Vehicle Diagnostics
 
One or more modules on the CAN network is open, shorted to ground or shorted to power - refer to the CAN bus diagnostics.
 
TSB 02-05-25-003 contains a repair procedure for this code
 

Trouble Code: U1016



Loss Of Communication With Engine Control Module

Possible Causes:



ECM Class 2 circuit is open, shorted to ground or to B+
 
ECM ignition power circuit has a high resistance condition
 
ECM main ground circuit(s) has a high resistance condition
 
ECM (module) may have failed and is pulling the circuit low
 
Refer to the Data Link Connector diagnostics
 

Trouble Code: U1026



Loss Of Communication With Automatic Transfer Case Controller

Possible Causes:



ATC Class 2 circuit is open, shorted to ground or to B+
 
ATC ignition power circuit has a high resistance condition
 
ATC main ground circuit(s) has a high resistance condition
 
ATC (module) may have failed and is pulling the circuit low
 
Refer to the Data Link Connector diagnostics
 

Trouble Code: U1040



Loss Of Communication With Brake/Traction Control Module

Possible Causes:



EBTCM Class 2 circuit is open, shorted to ground or to B+
 
EBTCM ignition power circuit has a high resistance condition
 
EBTCM main ground circuit(s) has a high resistance condition
 
EBTCM (module) may have failed and is pulling the circuit low
 
Refer to the Data Link Connector diagnostics
 

Trouble Code: U1064



Loss Of Communication With The BCM

Possible Causes:



BCM Class 2 circuit is open, shorted to ground or to B+
 
BCM ignition power circuit has a high resistance condition
 
BCM main ground circuit(s) has a high resistance condition
 
BCM (module) may have failed and is pulling the circuit low
 
Refer to the Data Link Connector diagnostics
 

Trouble Code: U1088



Loss Of Communication With Restraint Control Module

Possible Causes:



RCM Class 2 circuit is open, shorted to ground or to B+
 
RCM ignition power circuit has a high resistance condition
 
RCM main ground circuit(s) has a high resistance condition
 
RCM (module) may have failed and is pulling the circuit low
 
Refer to the Data Link Connector diagnostics
 

Trouble Code: U1096



Loss Of Communication With IPC

Possible Causes:



IPC Class 2 circuit is open, shorted to ground or to B+
 
IPC ignition power circuit has a high resistance condition
 
IPC main ground circuit(s) has a high resistance condition
 
IPC (module) may have failed and is pulling the circuit low
 
Refer to the Data Link Connector diagnostics
 

Trouble Code: U1192



Loss Of Communication With VTD (Passlock) Controller

Possible Causes:



VTD Class 2 circuit is open, shorted to ground or to B+
 
VTD ignition power circuit has a high resistance condition
 
VTD main ground circuit(s) has a high resistance condition
 
VTD (module) may have failed and is pulling the circuit low
 
Refer to the Data Link Connector diagnostics
 

Trouble Code: U1300



Class 2 Data Link Circuit Low Input

Possible Causes:



Class 2 data link is shorted to sensor ground or chassis ground
 
If the Scan Tool can communicate with the BCM, PCM or SDM, then the Class 2 data link is not "currently" shorted to ground.
 
One or more modules on the Class 2 line has a short to ground
 
Refer to the Data Link Connector diagnostics
 

Trouble Code: U1301



Class 2 Data Link Circuit High Input

Possible Causes:



Class 2 serial data line was in a high state for 3 seconds due to a short to VREF (5v)
 
One or more modules on Class 2 line has an short to power
 
Refer to the Data Link Connector diagnostics
 

Trouble Code: U1302



Class 2 Data Link Circuit Shorted Generic

Possible Causes:



Class 2 serial data line was in a high state for 3 seconds due to a short to VREF (5v)
 
If the Scan Tool can communicate with the BCM, PCM or SDM, then the Class 2 data link is not "currently" shorted to ground.
 
One or more modules on Class 2 line has an short to power
 
Refer to the Data Link Connector diagnostics
 

Trouble Code: U2100



CAN Bus Communication Malfunction

Possible Causes:



Check for a loose connection at the EBCM, PCM or the TCM
 
Class 2 circuit problem (one or more wires open or shorted)
 
One or more modules on the CAN network is open, shorted to ground or shorted to power - refer to the CAN bus diagnostics.
 

Trouble Code: U2102



More Controllers On The Bus Then Programmed

Possible Causes:



Check for a loose connection at the EBCM, PCM or the TCM
 
Read the data lists from the EBCM, PCM and TCM with a Scan Tool. If no data is received from a module, check its connector!
 
The module that cannot communicate may have failed
 
Refer to the CAN bus diagnostics.
 

Trouble Code: U2103



Fewer Controllers On The Bus Then Programmed

Possible Causes:



Check for a loose connection at the EBCM, PCM or the TCM
 
Read the data lists from the EBCM, PCM and TCM with a Scan Tool. If no data is received from a module, check its connector!
 
The module that cannot communicate may have failed
 
Refer to the CAN bus diagnostics.
 

Trouble Code: U2104



CAN Bus Reset Counter Overrun

Possible Causes:



Check for a loose connection at the EBCM, PCM or the TCM
 
Read the data lists from the EBCM, PCM and TCM with a Scan Tool. If no data is received from a module, check that module
 
The module that did not communicate all its data has failed
 
Refer to the CAN bus diagnostics
 

Trouble Code: U2105



Lost Communication With The ECM

Possible Causes:



Check for a loose connection at the ECM
 
Test the main power and ground circuits to the ECM
 
Check the CAN serial data circuit to the ECM
 
Refer to the CAN bus diagnostics
 

Trouble Code: U2106



Lost Communication With The TCM

Possible Causes:



Check for a loose connection at the TCM
 
Test the main power and ground circuits to the TCM
 
Check the CAN serial data circuit to the TCM
 
Refer to the CAN bus diagnostics
 

Trouble Code: U2107



Lost Communication With The Body Control Module

Possible Causes:



Check for a loose connection at the BCM
 
Test the main power and ground circuits to the BCM
 
Check the CAN serial data circuit to the BCM
 
Refer to the CAN bus diagnostics
 

Trouble Code: U2108



Lost Communication With The ABS/TCS Module

Possible Causes:



Check for a loose connection at the ABS/TCS
 
Test the main power and ground circuits to the ABS/TCS
 
Check the CAN serial data circuit to the ABS/TCS
 
Refer to the CAN bus diagnostics
 

 
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