DTC P0320 [YF (2.0L Zetec)]

id0102d0820300

DTC P0320

Ignition engine speed input circuit

DETECTION CONDITION

• If the PCM receive erratic signal from CKP sensor, PCM determines that CKP circuit has malfunction.

POSSIBLE CAUSE

• Connector or terminal malfunction
• CKP sensor is dirty
• Short to ground circuit between CKP sensor terminal 2 and PCM terminal 22
• Short to ground circuit between CKP sensor terminal 1 and PCM terminal 21
• Open circuit between CKP sensor terminal 2 and PCM terminal 22
• Open circuit between CKP sensor terminal 1 and PCM terminal 21

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has FREEZE FRAME DATA been recorded?
Yes
Go to next step.
No
Record FREEZE FRAME DATA on repair order, then go to next step.
2
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
• Check for related Service Information availability.
• Is any related Service Information available?
Yes
Perform repair or diagnosis according to available Service Information.
• If vehicle is not repaired, go to next step.
No
Go to next step.
3
VERIFY CKP SENSOR VOLTAGE
• Disconnect CMP sensor connector.
• Connect voltmeter between CMP sensor connector terminals 1 and 2 (sensor-side).
• Check the voltage in AC range while cranking the engine.
• Is there any voltage reading?
Yes
Go to step 5.
No
Go to next step.
4
INSPECT CKP SENSOR
• Turn ignition key to OFF.
• Perform CKP sensor inspection.
• Is CKP sensor normal?
Yes
Check crankshaft pulley for damage. Replace pulley and go to Step 11.
No
Replace CKP sensor, then go to Step 11.
5
CHECK CKP CIRCUIT FOR SHORT TO GROUND
• Disconnect CKP sensor connector.
• Check continuity between following terminal and body ground:
- CKP sensor connector terminal 1 (harness-side)
- CKP sensor connector terminal 2 (harness-side)
• Is there any continuity?
Yes
Repair or replace suspected harness, then go to Step 11.
No
Go to next step.
6
INSPECT CKP CIRCUITS FOR SHORTS
• Check continuity between CKP sensor connector terminals 1 and 2 (harness-side).
• Is there any continuity?
Yes
Repair or replace suspected harness, then go to Step 11.
No
Go to step 9.
7
INSPECT CKP SENSOR CONNECTOR FOR POOR CONNECTION
• Verify that the CKP sensor connector is connected securely.
• Is connector normal?
Yes
Go to next step.
No
Reconnect the connector, then go to Step 11.
8
INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Turn ignition key to OFF.
• Disconnect PCM connector.
• Check for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there any malfunction?
Yes
Repair terminal, then go to Step 11.
No
Go to next step.
9
INSPECT CKP CIRCUIT FOR OPEN CIRCUIT
• Disconnect CKP sensor connector.
• Disconnect PCM connector.
• Check continuity between following circuits:
- CKP sensor terminal 2 (harness-side) and PCM terminal 22
- CKP sensor terminal 1 (harness-side) and PCM terminal 21
• Is there any continuity?
Yes
Go to next step.
No
Repair or replace suspected harness, then go to Step 11.
10
INSPECT CKP SENSOR
• Turn ignition key to OFF.
• Perform CKP sensor inspection.
• Is CKP sensor normal?
Yes
Check for poor connection (damaged, pulled-out terminals, corrosion, etc.) or bent terminal of CKP sensor connector.
• Repair if necessary, then go to next step.
No
Replace CKP sensor and then go to next step.
11
VERIFY TROUBLESHOOTING OF DTC P0320 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Turn ignition key ON (engine OFF).
• Clear DTC from memory using WDS or equivalent.
• Start engine.
• Is pending code of same DTC present?
Yes
Replace PCM, then go to next step.
No
Go to next step.
12
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Is there any DTC present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.