On Board Diagnostics II PCED

1999 PCED On Board Diagnostics II

SECTION 5: Pinpoint Tests

HK: Variable Cam Timing (VCT)

HK1 DTC P1380: CHECK FOR KOEO OR KOER DTC

Start engine and bring up to operating temperature.
Check for DTC P1380 during KOEO or KOER Self-Test.

Is DTC P1380 present during KOEO or KOER Self-Test?

Yes	No
KEY OFF. GO to HK2 .	Unable to duplicate or identify fault at this time. GO to Pinpoint Test Step Z1 .

HK2 CHECK VPWR VOLTAGE AT VCT SOLENOID VALVE HARNESS CONNECTOR

Disconnect the VCT solenoid valve harness connector.
Key on.
Measure VCT circuit voltage at the VCT solenoid valve harness connector.

Is the voltage reading greater than 10.5 volts?

Yes	No
KEY OFF. GO to HK3 .	KEY OFF. REPAIR VPWR circuit.

HK3 CHECK VCT CIRCUIT FOR OPEN IN HARNESS

Note: Refer to the PCM connector pin numbers in the beginning of this pinpoint test.

Disconnect PCM.
Measure resistance of VCT circuit between PCM harness connector pin and the VCT solenoid valve harness connector.

Is the resistance less than 5.0 ohms?

Yes	No
GO to HK4 .	REPAIR open circuit.

HK4 CHECK VCT CIRCUIT FOR SHORT TO GROUND AND VPWR IN HARNESS

Measure resistance between VCT PCM Pin and PCM Pins VPWR, SIG RTN and PWR GND.

Is each resistance greater than 10,000 ohms?

Yes	No
GO to HK5 .	REPAIR short to GND or PWR.

HK5 CHECK VCT SOLENOID VALVE COIL RESISTANCE

Measure resistance of the VCT solenoid valve coil at the two connector terminals.

Is the resistance between 3.0 and 6.0 ohms?

Yes	No
GO to HK6 .	REPLACE VCT solenoid valve assembly.

HK6 CHECK VCT SOLENOID VALVE FOR SHORT TO CASE

Measure resistance between each connector terminal of the VCT solenoid valve and the solenoid body.

Is each resistance greater than 10,000 ohms?

Yes	No
REPLACE PCM (refer to Section 2 , Flash EEPROM).	REPLACE VCT solenoid valve.

HK11 DTC P1381 AND P1383: CHECK VCT FOR PROPER OPERATION

Key on.
Check for DTC P1381 or P1383 in KOER Self-Test.

Are P1381 or P1383 present during KOER Self-Test?

Yes	No
KEY OFF. DTC P1382 or P1383 present. GO to HK12 .	KEY OFF. Unable to duplicate or identify fault at this time. GO to Pinpoint Test Step Z1 .

HK12 CHECK CAMSHAFT TIMING

Verify camshaft timing. Refer to Engine, Section 303-01 in the Workshop Manual.

Is the camshaft timing within specification?

Yes	No
REPLACE camshaft advance mechanism. REFER to Camshaft, in Workshop Manual Section 303-01B. RESTORE vehicle. COMPLETE PCM Reset to clear DTC's. RERUN Quick Test.	REFER to Powertrain/Engine Group in the Workshop Manual for proper direction in setting cam timing. RESTORE vehicle. COMPLETE PCM Reset to clear DTC's. RERUN Quick Test.

HK15 CONTINUOUS MEMORY DTC P1380 (ONLY)

Start engine and bring up to operating temperature.
Access RCAM PID.
Increase rpm to approximately 1500 and maintain.
Wiggle and bend portions of the wiring from the PCM to the VCT solenoid valve.

Did the RCAM PID value change from positive to negative indicating a momentary open or short?

Yes	No
INSPECT harness connectors for proper pin fit, check for chaffed and broken wiring. NOTE: If the engine started running rough during this test the VCT Signal may have intermittently shorted to ground causing the cam to fully retard. REPAIR as necessary.	Unable to duplicate or identify fault at this time. If DTC P0340 was present with DTC P1380, REPAIR DTC P0340 first. Otherwise: GO to Pinpoint Test Step Z1 .

HK16 CONTINUOUS MEMORY DTC P1381 (ONLY)

Note: Testing is done with cooling fan off.

Start engine and bring up to operating temperature.
Access CAMERR PID.
Increase and decrease rpm from 1500 to idle several times.
Return to idle.

Did the CAMERR PID value change from negative to positive?

Yes	No
Unable to duplicate or identify fault at this time. GO to Pinpoint Test Step Z1 .	Intermittent DTC P1381 may be due to failures in the VCT unit assembly. REFER to Engine, Section 303-01 in the Workshop Manual for proper repair direction.

HK17 CONTINUOUS MEMORY DTC P1383 (ONLY)

Note: Testing is done with cooling fan off.

Start engine and bring up to operating temperature.
Access CAMERR PID.
Increase and decrease rpm from 1500 to idle several times.
Return engine to idle.

Does the engine run rough and CAMERR PID indicate 50% or greater error?

Yes	No
Intermittent DTC P1383 may be due to failures in the VCT unit assembly. REFER to Engine, Section 303-01 in the Workshop Manual for proper repair and direction.	Unable to duplicate or identify fault at this time. GO to Pinpoint Test Step Z1 .