Mazda DTC P2088 Diagnostic

DTC P2088	Variable valve timing control circuit low
DETECTION CONDITION	• If the PCM detects that the OCV drive current is less than the specification^* when the OCV control duty target is approx. 100 %, the PCM determines that the variable valve timing control circuit low. : Detected specification value depends on the battery voltage. Diagnostic support note* • This is a continuous monitor (CCM). • The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle. • PENDING CODE is available if the PCM detects the above malfunction condition. • FREEZE FRAME DATA is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE	• OCV malfunction • Connector or terminal malfunction • Open circuit in wiring harness between OCV terminal A and PCM terminal 2AK • Short to GND in wiring harness between OCV terminal A and PCM terminal 2AK • Open circuit in wiring harness between OCV terminal B and PCM terminal 2AG • Short to GND in wiring harness between OCV terminal B and PCM terminal 2AG • PCM malfunction

DTC P2088

Variable valve timing control circuit low

DETECTION CONDITION

• If the PCM detects that the OCV drive current is less than the specification^* when the OCV control duty target is approx. 100 %, the PCM determines that the variable valve timing control circuit low.

*: Detected specification value depends on the battery voltage.

Diagnostic support note

• This is a continuous monitor (CCM).

• The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle.

• PENDING CODE is available if the PCM detects the above malfunction condition.

• FREEZE FRAME DATA is available.

• The DTC is stored in the PCM memory.

POSSIBLE CAUSE

• OCV malfunction

• Connector or terminal malfunction

• Open circuit in wiring harness between OCV terminal A and PCM terminal 2AK

• Short to GND in wiring harness between OCV terminal A and PCM terminal 2AK

• Open circuit in wiring harness between OCV terminal B and PCM terminal 2AG

• Short to GND in wiring harness between OCV terminal B and PCM terminal 2AG

• PCM malfunction

Diagnostic procedure


STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related service repair information availability. • Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. • If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	INSPECT OCV CONNECTOR FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect the OCV connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the terminal, then go to Step 8.
3		No	Go to the next step.
4	INSPECT OCV CIRCUIT FOR SHORT TO GND • Turn the ignition switch off. • Inspect for continuity between the following circuits: – OCV terminal A (wiring harness-side) and body GND – OCV terminal B (wiring harness-side) and body GND • Is there continuity?	Yes	Repair or replace the wiring harness for a possible short to GND, then go to Step 8.
4		No	Go to the next step.
5	INSPECT OCV • Inspect the OCV. • Is there any malfunction?	Yes	Replace the OCV, then go to Step 8.
5		No	Go to the next step.
6	INSPECT PCM CONNECTOR FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the terminal, then go to Step 8.
6		No	Go to the next step.
7	INSPECT OCV CIRCUIT FOR OPEN CIRCUIT • Turn the ignition switch off. • Inspect for continuity between the following circuits: – OCV terminal A (wiring harness-side) and PCM terminal 2AK (wiring harness-side) – OCV terminal B (wiring harness-side) and PCM terminal 2AG (wiring harness-side) • Is there continuity?	Yes	Go to the next step.
7		No	Repair or replace the wiring harness for a possible open circuit, then go to the next step.
8	VERIFY TROUBLESHOOTING OF DTC P2088 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the WDS or equivalent. • Start the engine. • Is the same DTC present?	Yes	Replace the PCM, then go to the next step.
8		No	Go to the next step.
9	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. • Are any DTCs present?	Yes	Go to the applicable DTC inspection.
9		No	DTC troubleshooting completed.