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Home >> Suzuki >> 2011 >> Grand Vitara Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis >> Diagnostic Information and Procedures >> DTC P0122: Throttle / Pedal Position Sensor / Switch "A" (Main) Circuit Low; P0123: Throttle / Pedal Position Sensor / Switch "A" (Main) Circuit High >> DTC Troubleshooting

DTC Troubleshooting

P0122, P0123 DIAGNOSIS PROCEDURE

Step Action YES NO
1  Was "Engine and Emission Control System Check" performed?  Go to Step 2. Go to ENGINE AND EMISSION CONTROL SYSTEM CHECK:J24B .
2  TP sensor power supply circuit check 
  1. Turn OFF ignition switch and disconnect connector from throttle body assembly.
  2. Check for proper terminal connection to throttle body assembly connector.
  3. If connections are OK, turn ignition switch to ON position.
  4. Check that voltage between TP sensor power supply circuit (C1) and ground circuit (C4) is 5 V.

Is it in good condition? 		 Go to Step 5. Go to Step 3.
3  TP sensor ground circuit check 
  1. Check that voltage between TP sensor power supply circuit (C1) and vehicle body ground is 5 V.

Is it in good condition? 		 Repair or replace defective wire harness. If this DTC is detected again, substitute a known-good ECM and recheck. Go to Step 4.
4  TP sensor power supply circuit check 
  1. Turn OFF ignition switch and disconnect connectors from ECM.
  2. Check for proper terminal connection to ECM connectors.
  3. If connections are OK, check that TP sensor circuit is as follows.
    • Wiring harness resistance of TP sensor power supply circuit (C1) is less than 3 Ω.
    • Insulation resistance of TP sensor power supply circuit is infinity between throttle body assembly and vehicle body ground.
    • Insulation resistance of wire harness is infinity between TP sensor power supply terminal and each terminal at throttle body assembly connector.
    • Circuit voltage of TP sensor power supply circuit is 0 - 1 V with ignition switch in ON position.

Is it in good condition? 		 Substitute a known-good ECM and recheck. Repair or replace defective wire harness.
5  TP sensor (main) signal circuit check 
  1. Turn OFF ignition switch and disconnect connectors from ECM.
  2. Check for proper terminal connection to ECM connectors.
  3. If connections are OK, check that TP sensor (main) signal circuit (C2) is as follows.
    • Wiring harness resistance of TP sensor (main) signal circuit is less than 3 Ω.
    • Insulation resistance of TP sensor (main) signal circuit is infinity between throttle body assembly and vehicle body ground.
    • Insulation resistance of wire harness is infinity between TP sensor (main) signal terminal and each other terminal at throttle body assembly connector.
    • Circuit voltage of TP sensor (main) signal circuit is 0 - 1 V with ignition switch in ON position.

Is it in good condition? 		 Go to Step 6. Repair or replace defective wire harness.
6  TP sensor check 
  1. Check TP sensor for performance, see THROTTLE BODY ASSEMBLY ON-VEHICLE INSPECTION .

Is it in good condition? 		 Substitute a known-good ECM and recheck. Replace throttle body assembly.
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