How to fix engine code P2088

Tiny
1974RANGERS
  • MEMBER
  • 2003 MAZDA 6
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 95,000 MILES
Engine light code p2088
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Saturday, March 15th, 2014 AT 2:49 PM

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Tiny
KHLOW2008
  • EXPERT
DIAGNOSTIC TESTS > DTC P2088: OIL CONTROL VALVE ACTUATOR CIRCUIT - LOW INPUT >

Detection Condition
PCM monitors Oil Control Valve (OCV) voltage. If PCM detects OCV control voltage (calculated from OCV) is less than threshold voltage (calculated from battery positive voltage), PCM determines OCV circuit has malfunction. This is a Continuous Monitor (CM). MIL illuminates if PCM detects malfunction condition in two consecutive drive cycles or in one drive cycle while DTC for same malfunction has been stored in PCM. PENDING CODE is available if PCM detects malfunction condition during first drive cycle. FREEZE FRAME DATA is available. DTC is stored in PCM memory.

Possible causes are:
OCV malfunction
Open circuit in White wire between main relay and OCV 2-pin harness connector terminal "B"
Open circuit in Brown/Yellow wire between OCV harness connector terminal "A" and PCM 30-pin harness connector terminal "4M"
PCM malfunction
Poor connection of harness connectors at PCM and/or OCV
Short circuit to ground in Brown/Yellow wire between OCV harness connector terminal "A" and PCM 30-pin harness connector terminal "4M"

Diagnostic Procedure

1. If FREEZE FRAME DATA has been recorded, go to next step. If FREEZE FRAME DATA has not been recorded, record FREEZE FRAME DATA. Go to next step.

2. Verify Related Repair Information Availability - Check for related Service Bulletins and/or on-line repair information availability. If any related repair information is available, perform repair or diagnosis according to available repair information. If vehicle is not repaired, go to next step. If related repair information is not available, go to next step.

3. Inspect OCV Connector For Poor Connection - Disconnect OCV harness connector. Inspect for poor connection (such as damaged, pulled-out pins, corrosion). If malfunction is not present, go to next step. If malfunction is present, repair or replace terminal. After repair, go to step 9.

4. Inspect OCV - Perform OCV Inspection. If OCV is okay, go to next step. If OCV is faulty, replace OCV. After repair, go to step 9.

5. Inspect OCV Power Supply Circuit For Open Circuit - Disconnect OCV harness connector. Turn ignition on, engine off. Measure voltage between OCV harness connector terminal "B" (White wire) and body ground. See Fig 1. If battery voltage is present, go to next step. If battery voltage is not present, repair open circuit in White wire between OCV harness connector terminal "B" and main relay. After repair, go to step 9.

6. Inspect PCM Connector For Poor Connection - Disconnect PCM harness connectors. Inspect for poor connection (such as damaged, pulled-out terminals, corrosion) at PCM 30-pin harness connector terminal "4M" (Brown/Yellow wire). If malfunction is not present, go to next step. If malfunction is present, repair or replace terminal. After repair, go to step 9.

7. Inspect OCV Control Circuit For Short To Ground - Check for continuity between OCV harness connector terminal "A" (Brown/Yellow wire) and body ground. If continuity is not present, go to next step. If continuity is present, repair short circuit to ground in Brown/Yellow wire between OCV harness connector terminal "A" and PCM 30-pin harness connector terminal "4M". After repair, go to step 9.

8. Inspect OCV Control Circuit For Open Circuit - Connect OCV harness connector. Turn ignition on, engine off. Check for continuity in Brown/Yellow wire between OCV harness connector terminal "A" and PCM 30-pin harness connector terminal "4M". If continuity is not present, go to next step. If continuity is present, repair open circuit in Brown/Yellow wire between OCV harness connector terminal "A" and PCM 30-pin harness connector terminal "4M". After repair, go to next step.

9. Verify Trouble Shooting Of DTC P2088 Is Completed - Make sure to reconnect all disconnected connectors. Clear DTC from PCM memory using WDS or equivalent. Turn ignition off. Start engine and warm up completely. If PENDING CODE of same DTC is not present, go to next step. If PENDING CODE of same DTC is present, replace PCM. After repair, go to next step.

10. Verify After Repair Procedure - Using scan tool, perform After Repair Procedure. If any DTCs are present, go to appropriate DTC inspection. If no DTCs are present, trouble shooting is complete.
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Sunday, March 16th, 2014 AT 2:29 AM

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