P1330
DTC P1330 SPARK TIMING ADJUSTGENERAL DESCRIPTION
The PCM computes ignition timing in response to the signals from several sensors. The timing is fixed during the start-up phase. However, when the engine has been started and the vehicle is driven away, the ECM computes the optimum timing based on the engine speed, load and temperature. The ignition timing is fixed BTDC 5 and DTC P1330 is set when connecting Ignition control terminal of Multipurpose Check Connector and ground. If disconnect Ignition control terminal of Multipurpose Check Connector and ground, the DTC is erased automatically. Make sure to check for short circuit to ground between Ignition control terminal of Multipurpose Check Connector and chassis ground when DTC is set.
DTC DESCRIPTION
If the ignition control terminal of the Multipurpose Check Connector is grounded, the PCM determines that a fault exists and a DTC is stored.
DTC Detecting Condition:
TERMINAL & CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness and terminals.
Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?
YES: Repair as necessary and go to "Verification of Vehicle Repair" procedure.
NO: Go to " Control Circuit Inspection" procedure.
CONTROL CIRCUIT INSPECTION
1. Check for open in harness
1. Ignition "OFF"
2. Disconnect Multipurpose Check Connector and PCM connector.
3. Measure resistance between terminal "3" of Multipurpose Check Connector and terminal "23" of PCM harness connector.
Specification: Approx. below 1 Ohms
4. Is the measured resistance within specifications?
YES: Go to "Check for short to ground in harness "as below.
NO:
- Check open in harness between Multipurpose Check Connector and PCM connector.
- Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
2. Check for short to ground in harness
1. Ignition "OFF"
2. Disconnect Multipurpose Check Connector.
3. Measure resistance between terminal "3" of Multipurpose Check Connector and chassis ground.
Specification: Infinite
4. Is the measured resistance within specifications?
YES:
- Substitute with a known - good PCM and check for proper operation.
- If the problem is corrected, replace PCM and go to "Verification of Vehicle Repair" procedure.
NO:
- Check for short to ground in harness.
- Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Monitor and record the Freeze Frame Data for the Diagnostic Trouble Code(DTC) which has been diagnosed.
2. Using a Scantool, Clear the DTCs.
3. Operate the vehicle within conditions noted in the freeze frame data or enable conditions.
4. Monitor that all readiness tests have been verified as "Complete"
5. Are any DTCs present?
YES: Go to the applicable troubleshooting procedure.
NO: System is performing to specification at this time.