DTC P0122 [L8, LF]

id0102b1804200

DTC P0122

TP sensor No.1 circuit low input

DETECTION CONDITION

• If the PCM detects that the TP sensor No.1 voltage is below 0.1 V while the engine is running, the PCM determines that the TP sensor No.1 circuit has a malfunction.
Diagnostic support note
• This is a continuous monitor (CCM).
• The MIL illuminates if the PCM detects the above malfunction conditions during first drive cycles.
• 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

• TP sensor No.1 malfunction
• Connector or terminal malfunction
• Short to ground in wiring harness between throttle body terminal F and PCM terminal 2AK
• Open circuit in wiring harness between throttle body terminal F and PCM terminal 2AK
• Open circuit in wiring harness between throttle body terminal E and PCM terminal 2AO
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Have FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
• Verify related Service Information availability.
• Is any related Service Information available?
Yes
Perform repair or diagnosis according to the available Service Information.
• If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
CLASSIFY TP SENSOR NO.1 OR WIRING HARNESS MALFUNCTION
• Connect the M-MDS.
• Access TP1 PID.
• Disconnect throttle body connector.
• Connect a jumper wire between throttle body terminals E and F (wiring harness-side).
• Is the voltage above 4.9 V?
Yes
Go to the next step.
No
Go to Step 5.
4
INSPECT TP SENSOR NO.1
• Inspect the TP sensor No.1.
• Is TP sensor No.1 okay?
Yes
Inspect throttle body terminal E for poor connection. Repair or replace if necessary, then go to Step 8.
No
Replace the throttle body, then go to Step 8.
5
INSPECT POWER SUPPLY CIRCUIT VOLTAGE AT THROTTLE BODY CONNECTOR
• Turn the ignition switch to the ON position (Engine off).
• Measure the voltage at throttle body terminal E (wiring harness-side).
• Is the voltage within 4.5- 5.5 V?
Yes
Go to the next step.
No
Repair or replace for an open circuit between throttle body terminal E (wiring harness-side) and PCM terminal 2AO (wiring harness-side).
Then go to Step 8.
6
VERIFY TP SENSOR NO.1 SIGNAL CIRCUIT FOR OPEN CIRCUIT
• Turn the ignition switch off.
• Inspect for continuity between throttle body terminal F (wiring harness-side) and PCM terminal 2AK (wiring harness-side).
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness, then go to Step 8.
7
VERIFY TP SENSOR NO.1 SIGNAL CIRCUIT FOR SHORT TO GROUND
• Inspect for continuity between throttle body terminal F (wiring harness-side) and body ground.
• Is there continuity?
Yes
Repair or replace the wiring harness, then go to the next step.
No
Go to the next step.
8
VERIFY TROUBLESHOOTING OF DTC P0122 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Turn the ignition switch to the ON position (Engine off).
• Clear the DTC from the PCM memory using the M-MDS.
• Start the engine and warm it up completely.
• Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
9
VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR PROCEDURE".
• Is any DTC present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.