Test AG: Accelerator Pedal Position (APP) Sensor
PINPOINT TEST AG: ACCELERATOR PEDAL POSITION (APP) SENSORFlow Chart (Part 1):
Flow Chart (Part 2):
NOTE: Base idle should not be less than 0.5 volt
This pinpoint test is intended to diagnose the following:
- APP sensor (9F836)
- harness circuits: APP1, APP2, APP3, SIGRTN, and VREF
- powertrain control module (PCM) (12A650)
APP Sensor Connector
APP Sensor Connector:
PCM Connector
PCM Connector:
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AG1 : PRELIMINARY DIAGNOSIS
- Carry out a visual inspection.
- Retrieve and record any continuous and on-demand diagnostic trouble codes (DTCs)
- Record the freeze frame data
- Clear the DTCs.
- Carry out the KOEO self-test. Quick Test Description
- Are any DTCs retrieved?
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AG2 : DIAGNOSTIC TROUBLE CODES (DTCS) P2122, P2127, AND P2132
- Ignition ON, engine OFF.
- Access the PCM and monitor the APP1 PID.
- Access the PCM and monitor the APP2 PID.
- Access the PCM and monitor the APP3 PID.
- Apply and release the accelerator pedal
- Do all signal values change when the accelerator is applied and released?
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AG3 : CHECK THE VREF SENSOR CIRCUITS
- Ignition OFF.
- APP Sensor connector disconnected.
- Ignition ON, engine OFF.
- Measure the voltage between:
- Are the voltages between 4.5 - 5.5 volts?
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AG4 : CHECK THE APP SENSOR OPERATION
- Connect a 5 amp fused jumper wire between the following:
- Access the PCM and monitor the APP1 PID.
- Access the PCM and monitor the APP2 PID.
- Access the PCM and monitor the APP3 PID.
- Are the voltages between 4.5 V - 5.5 V?
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AG5 : CHECK THE APP SENSOR SIGNAL FOR AN OPEN
- Ignition OFF.
- PCM connector disconnected.
- Measure the resistance between:
- Are the resistances less than 5 Ohm?
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AG6 : CHECK THE APP SENSOR SIGNAL FOR A SHORT TO GROUND
- Measure the resistance between:
- Are the resistances greater than 10 kOhm?
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AG7 : DIAGNOSTIC TROUBLE CODES (DTCS) P2123, P2128, AND P2133
- Ignition ON, engine OFF.
- Access the PCM and monitor the APP1 PID.
- Access the PCM and monitor the APP2 PID.
- Access the PCM and monitor the APP3 PID.
- Apply and release the accelerator pedal
- Do all the signal values change when the accelerator is applied and released?
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AG8 : SIMULATE THE OPPOSITE SIGNAL
NOTE: The APP sensor is disconnected to simulate the opposite DTC.
- Ignition OFF.
- APP Sensor connector disconnected.
- Ignition ON, engine OFF.
- Access the PCM and monitor the APP1 PID.
- Access the PCM and monitor the APP2 PID.
- Access the PCM and monitor the APP3 PID.
- Do all PID signal values read 0 volts?
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AG9 : CHECK THE APP SIGNAL CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition OFF.
- PCM connector disconnected.
- Ignition ON, engine OFF.
- Measure the voltage between:
- Are the voltages less than 0.2 V?
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AG10 : CHECK THE APP SIGNAL CIRCUITS FOR A SHORT TO GROUND
- Ignition OFF.
- Measure the resistance between:
- Are the resistances greater than 10 kOhm?
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AG11 : CHECK THE APP SIGNAL RETURN CIRCUITS FOR AN OPEN
- Measure the resistance between:
- Are the resistances less than 5 ohms?
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AG12 : DIAGNOSTIC TROUBLE CODES (DTCS) P2138, P2139, AND P2140
- Clear the DTCs.
- Carry out the KOEO and KOER self-test. Quick Test Description
- Are DTCs P2138, P2139 or P2140 present?
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AG13 : CHECK THE ACCELERATOR PEDAL ASSEMBLY FOR BINDING
- Apply the accelerator pedal slowly to the floor and release
- Does the accelerator pedal move to the floor and return without binding?
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AG14 : CHECK THE APP SENSOR SIGNAL VOLTAGE RANGES
- Ignition ON, engine OFF.
- Access the PCM and monitor the APP1 PID.
- Access the PCM and monitor the APP2 PID.
- Access the PCM and monitor the APP3 PID.
- Apply the accelerator pedal slowly to the floor and release
- Are the PID voltage values within the range specified in the table?
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AG15 : DIAGNOSTIC TROUBLE CODE (DTC) P2104
- Ignition ON, engine OFF.
- Access the PCM and monitor the APP2 PID.
- Access the PCM and monitor the APP3 PID.
- Slowly apply and release the accelerator pedal while observing the PID voltage values
- Are the PID voltage values within the range specified in the table?
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AG16 : CHECK THE APP SENSOR
- Ignition OFF.
- APP Sensor connector disconnected.
- Measure the resistance between:
- Is the resistance between 2.7 kOhm - 6.5 kOhm?
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AG17 : CHECK THE APP SENSOR SIGNAL CIRCUITS
- PCM connector disconnected.
- Measure the resistance between:
- Is the resistance greater than 10 kOhm?
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AG18 : CHECK FOR CORRECT PCM OPERATION
- Disconnect all the PCM connectors.
- Visually inspect for:
- pushed out pins
- corrosion
- Connect all the PCM connectors and make sure they seat correctly.
- Carry out the PCM self-test and verify the concern is still present.
- Is the concern still present?
