DTC P0122: Throttle/Pedal Position Sensor/Switch "A" Circuit Low [11/2021 - ]: Procedure

1. Turn the ignition switch to ON.
2. Using GTS or a general scan tool, read the DTC of [Engine].

   Powertrain > Engine Control System > Trouble Codes 

   Is DTC P0122 displayed? (Current code)

   Result	Proceed to
   Yes	A
   No (Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.)	B

Result: 

B 

PERFORM SIMULATION TEST 

Result: 

A 

See step  2

1. Turn the ignition switch to OFF.
2. Check for poor contact of ECM and throttle body with motor assembly connector.

   Is there poor contact in ECM or throttle body with motor assembly connector?

   Result	Proceed to
   Yes (Repair the poor contact of ECM or throttle body with motor assembly connector.)	A
   No	B

Result: 

A 

REPAIR CONNECTOR 

Result: 

B 

See step  3

1. Disconnect the connector from ECM.
2. Disconnect the connectors from throttle body with motor assembly.
3. Measure the resistance of harness between ECM connector and throttle body with motor assembly connector.

   Connector & terminal

   B1-27 (TPS5V) - B30-5

   B1-29 (THSM) - B30-6

   Is the resistance less than 1 Ω?

   Result	Proceed to
   Yes	A
   No (Repair the open circuit of harness between ECM connector and throttle body with motor assembly connector.)	B

Result: 

B 

REPAIR HARNESS 

Result: 

A 

See step  4

1. Measure the resistance between the ECM connector and engine ground.

   Connector & terminal

   B1-27 (TPS5V) - Engine ground

   B1-29 (THSM) - Engine ground

   Is the resistance 1 MΩ or more?

   Result	Proceed to
   Yes	A
   No (Repair the ground short circuit of harness between ECM connector and throttle body with motor assembly connector.)	B

Result: 

B 

REPAIR HARNESS 

Result: 

A 

See step  5

1. Connect the connector to ECM.
2. Turn the ignition switch to ON.
3. Measure the voltage between throttle body with motor assembly connector and engine ground.

   Connector & terminal

   B30-5 - Engine ground

   Is the voltage 4.5 - 5.5 V?

   Result	Proceed to
   Yes (Replace the throttle body with motor assembly.)	A
   No (Replace the ECM.)	B

Result: 

A 

REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY. Refer to  REMOVAL [11/2021 - ] 

Result: 

B 

REPLACE ECM. Refer to  REMOVAL [11/2021 - ]