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DTC P2138: Accelerator Pedal Position Sensor (main and sub) Circuit Range/Performance Problem
 
 
 
 
ACCELERATOR PEDAL POSITION SENSOR (main and sub) RANGE/PERFORMANCE PROBLEM CIRCUIT
  • Refer to DTC P2122 - Accelerator Pedal Position Sensor (main) Circuit Low Input .
  • Refer to DTC P2127 - Accelerator Pedal Position Sensor (sub) Circuit Low Input .
 
 
CIRCUIT OPERATION
  • Refer to DTC P2122 - Accelerator Pedal Position Sensor (main) Circuit Low Input .
  • Refer to DTC P2127 - Accelerator Pedal Position Sensor (sub) Circuit Low Input .
 
 
TECHNICAL DESCRIPTION
ECM checks the accelerator pedal position sensor output signal characteristics for abnormal conditions.
 
 
DESCRIPTIONS OF MONITOR METHODS
Detect malfunction if the relation between accelerator pedal position sensor (main) and accelerator pedal position sensor (sub) is wrong.
 
 
MONITOR EXECUTION
  • Continuous
 
 
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC set in memory for the item monitored below)
  • Not applicable
Sensor (The sensor below is determined to be normal)
  • Not applicable
 
 
DTC SET CONDITIONS <Range/Performance problem -relation between main and sub>
Logic Flow Chart
 
 
Check Condition
  • Ignition switch is "ON" position.
Judgment Criterion
  • Voltage obtained with the formula given below is 0.4 volt or higher for 0.4 second: [accelerator pedal position sensor (sub) voltage - accelerator pedal position sensor (main) voltage].
    noteThe accelerator pedal position sensor voltage used for the judgment is converted into the accelerator pedal position sensor voltage for the internal processing by the ECM.
 
 
DTC SET CONDITIONS <Range/Performance problem -relation between main and sub>
Logic Flow Chart
 
 
Check Condition
  • Ignition switch is "ON" position.
Judgment Criterion
  • Voltage obtained with the formula given below is 0.4 volt or higher for 0.4 second: [accelerator pedal position sensor (main) voltage - accelerator pedal position sensor (sub) voltage].
    noteThe accelerator pedal position sensor voltage used for the judgment is converted into the accelerator pedal position sensor voltage for the internal processing by the ECM.
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • Throttle opening degree is restricted.
  • Throttle opening degree position is in default position if accelerator pedal position sensor (sub) fails.
 
 
OBD-II DRIVE CYCLE PATTERN
  • Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
  • Accelerator pedal position sensor failed.
  • Accelerator pedal position sensor circuit, harness damage or connector damage.
  • ECM failed.

 
 
DIAGNOSIS
STEP 1. Check the continuity at accelerator pedal position sensor harness side connector.
(1) Disconnect the accelerator pedal position sensor connector and measure at the harness side.
(2) Check for the continuity between terminal APSE line and ground.
  • Continuity (2 ohms or less)
Does continuity exist?
Go to Step 4.
Go to Step 2.
 
STEP 2. Check of harness damage in APSE line between accelerator pedal position sensor connector and ECM connector.
Is the harness wire in good condition?
Go to Step 3.
Repair the connector(s) or wiring harness. Then go to Step 11.
 
STEP 3. Check the trouble symptoms.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
(2) Check the diagnostic trouble code (DTC).
Is DTC P2138 set?
Replace the ECM (Refer to Removal and Installation ). Then go to Step 11.
It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions .
 
STEP 4. Check the continuity at accelerator pedal position sensor harness side connector.
(1) Disconnect the accelerator pedal position sensor connector and measure at the harness side.
(2) Check for the continuity between terminal APE line and ground.
  • Continuity (2 ohms or less)
Does continuity exist?
Go to Step 6.
Go to Step 5.
 
STEP 5. Check of harness damage in APE line between accelerator pedal position sensor connector and ECM connector.
Is the harness wire in good condition?
Go to Step 3.
Repair the connector(s) or wiring harness. Then go to Step 11.
 
STEP 6. Check of harness damage in APS5 line between accelerator pedal position sensor connector and ECM connector.
Is the harness wire in good condition?
Go to Step 7.
Repair the connector(s) or wiring harness. Then go to Step 11.
 
STEP 7. Check of harness damage in AP5 line between accelerator pedal position sensor connector and ECM connector.
Is the harness wire in good condition?
Go to Step 8.
Repair the connector(s) or wiring harness. Then go to Step 11.
 
STEP 8. Check of harness damage in APSM line between accelerator pedal position sensor connector and ECM connector.
Is the harness wire in good condition?
Go to Step 9.
Repair the connector(s) or wiring harness. Then go to Step 11.
 
STEP 9. Check of harness damage in APSS line between accelerator pedal position sensor connector and ECM connector.
Is the harness wire in good condition?
Go to Step 10.
Repair the connector(s) or wiring harness. Then go to Step 11.
 
STEP 10. Replace the accelerator pedal assembly.
(1) Replace the accelerator pedal assembly.
(2) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
(3) Check the diagnostic trouble code (DTC).
Is DTC P2138 set?
Replace the ECM (Refer to Removal and Installation ). Then go to Step 11.
The inspection is complete.
 
STEP 11. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
(2) Check the diagnostic trouble code (DTC).
Is DTC P2138 set?
Retry the troubleshooting.
The inspection is complete.