LS400 1990-1997

4.0L V8 VIN H Auto 4

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Trouble Code: P1315



Igniter No. 4 Circuit Malfunction

Possible Causes:



IGT or IGF signal circuit is open or shorted to ground
 
Igniter is damaged or has failed
 
PCM has failed
 

Trouble Code: P1320



Igniter No. 5 Circuit Malfunction

Possible Causes:



IGT or IGF signal circuit is open between the igniter and PCM
 
IGT or IGF signal circuit is shorted to ground
 
Igniter is damaged or has failed
 
PCM has failed
 

Trouble Code: P1325



Igniter No. 6 Circuit Malfunction

Possible Causes:



IGT or IGF signal circuit is open between the igniter and PCM
 
IGT or IGF signal circuit is shorted to ground
 
Igniter is damaged or has failed
 
PCM has failed
 

Trouble Code: P1330



Igniter No. 7 Circuit Malfunction

Possible Causes:



IGT or IGF signal circuit is open between the igniter and PCM
 
IGT or IGF signal circuit is shorted to ground
 
Igniter is damaged or has failed
 
PCM has failed
 

Trouble Code: P1335



Crankshaft Position Sensor Circuit Malfunction

Possible Causes:



CKP sensor (+) circuit is open or shorted to ground
 
CKP sensor (-) circuit is open or shorted to ground
 
CKP sensor (+), (-) circuit is shorted to VREF or system power
 
CKP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1340



Igniter No. 8 Circuit Malfunction

Possible Causes:



IGT or IGF signal circuit is open between the igniter and PCM
 
IGT or IGF signal circuit is shorted to ground
 
Igniter is damaged or has failed
 
PCM has failed
 

Trouble Code: P1500



Starter Signal Circuit Malfunction

Possible Causes:



Engine starter signal circuit is open or shorted to ground
 
Engine starter signal circuit is shorted to system power (B+)
 
Starter has failed
 
PCM has failed
 

Trouble Code: P1600



PCM Battery Backup Circuit Malfunction

Possible Causes:



Battery backup circuit is open (check EFI fuse and fuse link)
 
Battery terminals are corroded or loose
 
PCM has failed
 

Trouble Code: P1605



Knock Control CPU Malfunction

Possible Causes:



Clear the codes and determine if this code resets. If the same trouble code (P1605 resets), the PCM has failed.
 
TSB TC002-03 (6/03) contains information related to this code
 

Trouble Code: P1780



Park/Neutral Position Switch Circuit Malfunction

Possible Causes:



P/N switch is shorted to ground or wiring harness is shorted
 
P/N switch is out-of-adjustment, damaged or has failed
 
PCM has failed
 

Trouble Code: P2102



Throttle Actuator Control Motor Circuit Low Input

Possible Causes:



Throttle motor connector is damaged or open
 
Throttle control motor circuit is open
 
Throttle control motor is damaged or has failed
 
PCM has failed
 

Trouble Code: P2103



Throttle Actuator Control Motor Circuit High Input

Possible Causes:



Throttle motor connector is damaged or shorted
 
Throttle control motor circuit is shorted
 
Throttle control motor is damaged or has failed
 
PCM has failed
 

Trouble Code: P2111



Throttle Actuator Control System Stuck Open

Possible Causes:



Throttle control motor circuit is open
 
Throttle control motor is damaged or has failed
 
Throttle body or throttle valve is damaged or has failed
 

Trouble Code: P2112



Throttle Actuator Control System Stuck Closed

Possible Causes:



Throttle control motor circuit is shorted
 
Throttle control motor is damaged or has failed
 
Throttle body or throttle valve is damaged or has failed
 

Trouble Code: P2118



Throttle Actuator Control Motor Current Performance

Possible Causes:



ETCS power source circuit is open
 
PCM has failed
 

Trouble Code: P2119



Throttle Actuator Control Throttle Body Performance

Possible Causes:



ETCS throttle control system
 
PCM has failed
 

Trouble Code: P2120



Throttle Pedal Position Sensor/Switch 'D' Circuit Malfunction

Possible Causes:



APP sensor signal circuit is open or shorted to ground
 
APP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P2121



Accelerator Pedal Position Sensor Signal Performance

Possible Causes:



APP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P2122



Throttle Pedal Position Sensor/Switch 'D' Circuit Low Input

Possible Causes:



APP sensor signal circuit is shorted to ground
 
APP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P2123



Throttle Pedal Position Sensor/Switch 'D' Circuit High Input

Possible Causes:



APP sensor signal circuit is open
 
APP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P2125



Throttle Pedal Position Sensor/Switch 'E' Circuit Malfunction

Possible Causes:



APP sensor signal circuit is open or shorted to ground
 
APP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P2127



Throttle Pedal Position Sensor/Switch 'E' Circuit Low Input

Possible Causes:



APP sensor signal circuit is shorted to ground
 
APP sensor has failed, or the PCM has failed
 

Trouble Code: P2128



Throttle Pedal Position Sensor/Switch 'E' Circuit High Input

Possible Causes:



APP sensor signal circuit is open
 
APP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P2135



Throttle Pedal Position Sensor/Switch 'A'/'B' Voltage Correlation

Possible Causes:



APP sensor signal circuit is open
 
APP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P2138



Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation

Possible Causes:



APP sensor signal circuit is open
 
APP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P2A00



Air Fuel Sensor (Bank 1 Sensor 1) Signal Slow Response

Possible Causes:



A/F sensor connector is damaged or loose
 
A/F sensor circuit is open or shorted, or the sensor has failed
 
A/F sensor heater is damaged or has failed
 
A/F sensor heater relay circuit is open or the relay has failed
 
Fuel delivery component has failed (fuel pressure regulator, one or more fuel injectors is leaking or severely restricted)
 
Induction system problems (air leaks or restricted air filter)
 
PCM has failed
 

 
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