DTC P0122[LF ATX (FN4A-EL), L3 ATX]

id0102b6804200

DTC P0122

TP sensor No.1 circuit low input

DETECTION CONDITION

•  If the PCM detects the TP sensor voltage is below 0.2 V while the engine running to on, the PCM determines that the TP circuit has malfunction.

Diagnostic support note

•  This is a continuous monitor (CCM).

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

•  FREEZE FRAME DATA is available.

•  DTC is stored in the PCM memory.

POSSIBLE CAUSE

•  TP sensor malfunction

•  Connector or terminal malfunction

•  Short to ground in wiring harness between TP sensor terminal A and PCM terminal 2M

•  Open circuit in wiring harness between TP sensor terminal A and PCM terminal 2M

•  Short to ground in wiring harness between TP sensor terminal B and PCM terminal 2K

•  Open circuit in wiring harness between TP sensor terminal B and PCM terminal 2K

DTC P0122	TP sensor No.1 circuit low input
DETECTION CONDITION	• If the PCM detects the TP sensor voltage is below 0.2 V while the engine running to on, the PCM determines that the TP circuit has malfunction. Diagnostic support note • This is a continuous monitor (CCM). • The MIL illuminates if the PCM detects the above malfunction condition during the first drive cycle. • FREEZE FRAME DATA is available. • DTC is stored in the PCM memory.
POSSIBLE CAUSE	• TP sensor malfunction • Connector or terminal malfunction • Short to ground in wiring harness between TP sensor terminal A and PCM terminal 2M • Open circuit in wiring harness between TP sensor terminal A and PCM terminal 2M • Short to ground in wiring harness between TP sensor terminal B and PCM terminal 2K • Open circuit in wiring harness between TP sensor terminal B and PCM terminal 2K

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded?	Yes	Go to next step.
1		No	Record FREEZE FRAME DATA on 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.
2		No	Go to the next step.
3	CLASSIFY TP SENSOR OR HARNESS MALFUNCTION • Connect M-MDS. • Access TP1 PID. • Disconnect throttle body connector. • Connect a jumper wire between throttle body terminals A and B. • Is the voltage above 4.85 V?	Yes	Go to the next step.
3		No	Go to Step 5.
4	INSPECT TP SENSOR • Inspect the TP sensor. (See THROTTLE POSITION (TP) SENSOR INSPECTION[LF, L3].) • Is TP sensor okay?	Yes	Inspect for poor throttle body connector terminal B connection. Repair or replace if necessary, then go to Step 8.
4		No	Replace the throttle body, then go to Step 8.
5	INSPECT POWER SUPPLY CIRCUIT VOLTAGE AT THROTTLE BODY CONNECTOR Note • If DTC P0107 are also retrieved with P0122, go to CONSTANT VOLTAGE troubleshooting procedure. • Turn the ignition switch to the ON position (Engine off). • Measure the voltage at throttle body terminal B. • Is the voltage within 4.5—5.5 V?	Yes	Go to next step.
5		No	Repair or replace open circuit between throttle body connector terminal B and PCM connector terminal 2K. Then, then go to Step 8.
6	VERIFY TP1 SIGNAL CIRCUIT FOR OPEN CIRCUIT • Turn the ignition switch off. • Inspect for continuity between the following terminals: ― Throttle body terminal A and PCM terminal 2M ― Throttle body terminal B and PCM terminal 2K • Is there continuity?	Yes	Go to the next step.
6		No	Repair or replace the harness, then go to Step 8.
7	VERIFY TP1 SIGNAL CIRCUIT FOR SHORT TO GROUND • Inspect for continuity between the following terminals and body ground: ― Throttle body terminal A and body ground. ― Throttle body terminal B and body ground. • Is there continuity?	Yes	Repair or replace the harness, then go to the next step.
7		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 next step. (See PCM REMOVAL/INSTALLATION[LF, L3].)
8		No	Go to the next step.
9	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE[LF ATX (FN4A-EL), L3 ATX].) • Is any DTC present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE[LF ATX (FN4A-EL), L3 ATX].)
9		No	Troubleshooting completed.