DTC P0122

DTC P0122	TP sensor NO. 1 circuit low input
DETECTION CONDITION	The PCM monitors the input voltage from the TP sensor NO. 1 when the engine is running. If the input voltage is less than 0.3 V, the PCM determines that the TP sensor NO. 1 circuit input voltage is low. 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. FREEZE FRAME DATA (Mode 2/Mode 12) is available. The DTC is stored in the PCM memory.
POSSIBLE CAUSE	Throttle body connector or terminals malfunction Short to ground in wiring harness between throttle body terminal E and PCM terminal 2AO Short to ground in wiring harness between throttle body terminal F and PCM terminal 2AK PCM connector or terminals malfunction Open circuit in wiring harness between throttle body terminal E and PCM terminal 2AO Open circuit in wiring harness between throttle body terminal F and PCM terminal 2AK TP sensor NO. 1 malfunction PCM malfunction

TP sensor NO. 1 circuit low input

DETECTION CONDITION

The PCM monitors the input voltage from the TP sensor NO. 1 when the engine is running. If the input voltage is less than 0.3 V, the PCM determines that the TP sensor NO. 1 circuit input voltage is low.

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.
FREEZE FRAME DATA (Mode 2/Mode 12) is available.
The DTC is stored in the PCM memory.

POSSIBLE CAUSE

Throttle body connector or terminals malfunction
Short to ground in wiring harness between throttle body terminal E and PCM terminal 2AO
Short to ground in wiring harness between throttle body terminal F and PCM terminal 2AK
PCM connector or terminals malfunction
Open circuit in wiring harness between throttle body terminal E and PCM terminal 2AO
Open circuit in wiring harness between throttle body terminal F and PCM terminal 2AK
TP sensor NO. 1 malfunction
PCM malfunction

DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA (MODE 12) HAS BEEN RECORDED Has the FREEZE FRAME DATA (Mode 12) been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA (Mode 12) on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Verify related Service Bulletins and/or on-line 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 THROTTLE BODY CONNECTOR FOR POOR CONNECTION Turn the ignition switch off. Disconnect the throttle body connector. Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 8.
3		No	Go to the next step.
4	INSPECT TP SENSOR NO. 1 CIRCUIT FOR SHORT TO GROUND Throttle body connector is disconnected. Turn the ignition switch off. Inspect for continuity between the following circuits: Throttle body terminal E (wiring harness-side) and body ground Throttle body terminal F (wiring harness-side) and body ground Is there continuity?	Yes	If the short to ground circuit could be detected: Repair or replace the wiring harness for a possible short to ground. If the short to ground circuit could not be detected: Replace the PCM (short to ground in the PCM internal circuit). (See PCM REMOVAL/INSTALLATION ). Go to Step 8.
4		No	Go to the next step.
5	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 connector and/or terminals, then go to Step 8.
5		No	Go to the next step.
6	INSPECT TP SENSOR NO. 1 CIRCUIT FOR OPEN CIRCUIT Throttle body and PCM connectors are disconnected. Turn the ignition switch off. Inspect for continuity between the following circuits: Throttle body terminal E (wiring harness-side) and PCM terminal 2AO (wiring harness-side) Throttle body terminal F (wiring harness-side) and PCM terminal 2AK (wiring harness-side) Is there continuity?	Yes	Go to the next step.
6		No	Repair or replace the wiring harness for a possible open circuit, then go to Step 8.
7	INSPECT TP SENSOR NO. 1 Inspect the TP sensor NO. 1. (See THROTTLE POSITION (TP) SENSOR INSPECTION ). Is there any malfunction?	Yes	Replace the throttle body, then go to the next step. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION ).
7		No	Go to the next step.
8	VERIFY TROUBLESHOOTING OF DTC P0122 COMPLETED Make sure to reconnect all disconnected connectors. Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE ). Perform the KOEO or KOER self test. (See KOEO/KOER SELF TEST ). Is the same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION ).
8		No	Go to the next step.
9	VERIFY AFTER REPAIR PROCEDURE Perform the "AFTER REPAIR PROCEDURE ". (See AFTER REPAIR PROCEDURE ). Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE ).
9		No	DTC troubleshooting completed.