FAULT CODE 131 (IVS) Accelerator Position Sensor Circuit

Transcription

1 FAULT CODE 131 (IVS) Accelerator Position Sensor Circuit Overview CODE REASON EFFECT Fault Code: 131 PID: P091 SPN: 91 FMI: 3 LAMP: Red SRT: High voltage detected at accelerator position signal pin 11 of the OEM harness connector. Severe derate (power and speed). Accelerator Position Sensor Circuit SMALL MEDIUM LARGE Circuit Description The accelerator position sensor signals the electronic control module (ECM) when the driver pushes on the accelerator pedal. The accelerator position circuit has three wires: +5 VDC supply (wire 18), return ground (wire 19), and signal (wire 11). Component Location Page 1 of 15

2 The accelerator position sensor is located on the accelerator pedal. Shop Talk If all wiring and sensors check good, replace the accelerator position sensor circuit wires between the accelerator pedal and ECM with new wires. Run them through, or around, the bulkhead without using the bulkhead connector. Test with these wires. If fault clears, replace the OEM harness. Seal the bulkhead openings around the wires to prevent toxic, noxious fumes from seeping into the operator area. The ECM and accelerator pedal must be calibrated to each other for proper engine response. This is required when a new accelerator pedal is installed, replaced, an ECM is replaced, a new calibration is downloaded to the ECM, or the accelerator pedal wiring is disconnected while keyswitch ON. With keyswitch ON slowly push the accelerator to the floor and release, do this three times. This recalibrates the ECM and accelerator pedal. Note: The three wires in the accelerator position sensor circuit must be twisted together. Cautions and Warnings leads when taking a measurement: Part Number male Deutsch/AMP/Metri-Pack test lead Part Number female Weather-Pack test lead Part Number pin repair connector. lead when taking a measurement: Part Number male Deutsch/AMP/Metri-Pack test lead. leads when taking a measurement: Part Number female Weather-Pack test lead Part Number pin repair connector. Page 2 of 15

3 leads when taking a measurement: Part Number female Weather-Pack test lead Part Number pin repair connector. To reduce the possibility of damaging a new ECM, all other active fault codes must be investigated prior to replacing the ECM. To reduce the possibility of pin and harness damage, use this test lead when taking a measurement: Part Number female Deutsch/AMP/Metri-Pack test lead. Troubleshooting Steps STEPS STEP 1. Check the accelerator pedal. STEP 1A. Inspect the harness and the accelerator position sensor connector pins. STEP 1B. Check for continuity from ECM to accelerator position sensor. STEP 1C. Check the accelerator position resistance. STEP 1D. Check the resistance between sensor pins. SPECIFICATIONS No damaged pins Less than 10 ohms 2000 to 3000 ohms Released: 1500 to 3000 ohms, depressed: 200 to 1500 ohms. Released resistance must be at least 1000 ohms more than depressed resistance. Page 3 of 15

4 STEP 2. Check the OEM harness. STEP 2A. Inspect the harness, bulkhead connector, and the ECM connector pins. STEP 2B. Check the resistance between the +5 VDC supply and return wires. STEP 2C. Check the resistance in the +5 VDC supply wire and signal wire circuit. STEP 2D. Check for a short circuit from the accelerator position signal and return wires to all other pins in the OEM harness. STEP 3. Check for the ECM response. STEP 3A. Check for the appropriate ECM response. STEP 3B. Check ECM signal pin resistance. STEP 4. Clear the fault code. STEP 4A. Disable the fault code. STEP 4B. Clear the inactive fault codes. No damaged pins 2000 to 3000 ohms Released: 1500 to 3000 ohms, depressed: 200 to 1500 ohms More than 100k ohms Fault Codes 131 inactive, Fault Codes 132 active Less than 100k ohms Fault Codes 131 inactive All faults cleared Guided Step 1 - Check the accelerator pedal. Guided Step 1A - Inspect the harness and the accelerator position sensor connector pins. Turn keyswitch "OFF". Disconnect the OEM harness from the accelerator position sensor. Page 4 of 15

5 Bent or broken pins Pushed back or expanded pins Corroded pins Moisture in or on the connector Missing or damaged seals. NOT No damaged pins Repair the damaged pins. Repair the OEM harness. Refer to Procedure or Replace the OEM harness. Refer to the OEM Troubleshooting and Repair Manual. Replace the accelerator position sensor. Refer to the OEM Troubleshooting and Repair Manual. Go to 1B Guided Step 1B - Check for continuity from ECM to accelerator position sensor. lead when taking a measurement: Part Number male Deutsch/AMP/Metri-Pack test lead. Turn keyswitch OFF. Connect OEM harness to bulkhead connector. Disconnect OEM harness from accelerator pedal. Page 5 of 15

6 Disconnect OEM harness connector from ECM. Measure the resistance from pin 11 of the OEM ECM connector to the signal pin of the accelerator position sensor connector. Measure the resistance from pin 19 of the OEM ECM connector to the return pin of the accelerator position sensor connector. Measure the resistance from pin 18 of the OEM ECM connector to the voltage supply pin of the accelerator position sensor connector. NOT Less than 10 ohms Repair or replace the accelerator position sensor wiring. Refer to Procedure or Go to 1C Guided Step 1C - Check the accelerator position resistance. leads when taking a measurement: Part Number female Weather-Pack test lead Part Number pin repair connector. Page 6 of 15

7 Turn keyswitch "OFF". Disconnect the OEM harness from the accelerator position sensor. SMALL MEDIUM LARGE Measure the resistance between the +5 VDC supply and the accelerator position sensor return on the sensor side of the accelerator position sensor when the accelerator pedal is released and when it is depressed. Note: Install a 3-pin repair connector, Part Number , into the accelerator position sensor for IVS; a 6-pin repair connector, Part Number , for ISS; and the breakout cable, Part Number , for SSS if needed. NOT 2000 to 3000 ohms Replace the accelerator position sensor. Refer to the OEM Troubleshooting and Repair Manual. Go to 1D Guided Step 1D - Check the resistance between sensor pins. leads when taking a measurement: Part Number female Weather-Pack test lead Part Number pin repair connector. Page 7 of 15

8 Turn keyswitch "OFF". Disconnect the OEM harness from the accelerator position sensor. SMALL MEDIUM LARGE Note: Take the measurement when the pedal is depressed and released. Note: Install a 3-pin repair connector, Part Number , into the accelerator position sensor for IVS; a 6-pin repair connector, Part Number , for ISS; and the breakout cable, Part Number , for SSS if needed. Measure the resistance between the +5 VDC supply wire and the signal wire on the sensor side of the accelerator position sensor. Released: 1500 to 3000 ohms, depressed: 200 to 1500 ohms. NOT Replace the accelerator position sensor. Refer to the OEM Troubleshooting and Repair Manual. Released resistance must be at least 1000 ohms more than depressed resistance. Go to 2A Guided Step 2 - Check the OEM harness. Guided Step 2A - Inspect the harness, bulkhead connector, and the ECM connector pins. Page 8 of 15

9 To reduce the possibility of damaging a new ECM, all other active fault codes must be investigated prior to replacing the ECM. Turn keyswitch "OFF". Disconnect the OEM harness connector from the ECM. Disconnect the OEM harness from the accelerator pedal. Disconnect the OEM harness from the bulkhead connector. Clean and flush the connector with electronic contact cleaner, Part Number Bent or broken pins Pushed back or expanded pins Corroded pins Moisture in or on the connector Missing or damaged seals. NOT No damaged pins Repair the damaged pins. Repair the OEM harness. Refer to Procedure Replace the OEM harness. Refer to the OEM Troubleshooting and Repair Manual. Replace the ECM. Refer to Procedure Replace the o-ring on the 28-pin connector if it is damaged or missing. Refer to Procedure Go to 2B Page 9 of 15

10 Guided Step 2B - Check the resistance between the +5 VDC supply and return wires. lead when taking a measurement: Part Number male Deutsch/AMP/Metri-Pack test lead. Turn keyswitch "OFF". Connect the OEM harness to the accelerator position sensor. Connect the OEM harness to the bulkhead connector. Disconnect the OEM harness connector from the ECM. SMALL MEDIUM LARGE Measure the resistance between pin 18 and pin 19 in the OEM harness when the accelerator pedal is up or down. NOT 2000 to 3000 ohms Repair or replace the OEM harness. Refer to the OEM Troubleshooting and Repair Manual. Go to 2C Page 10 of 15

11 Guided Step 2C - Check the resistance in the +5 VDC supply wire and the signal wire circuit. lead when taking a measurement: Part Number male Deutsch/AMP/Metri-Pack test lead. Turn keyswitch "OFF". Connect the OEM harness to the accelerator position sensor. Connect the OEM harness to the bulkhead connector. Disconnect the OEM harness connector from the ECM. SMALL MEDIUM LARGE Measure the resistance between pin 18 and pin 11 when the accelerator pedal is released and again when it is depressed. Released: 1500 to 3000 ohms, depressed: 200 to 1500 ohms NOT Repair or replace OEM harness. Refer to the OEM Troubleshooting and Repair Manual. Go to 2D Guided Step 2D - Check for a short circuit from the accelerator position signal and return wires to all other pins in the OEM harness. Page 11 of 15

12 lead when taking a measurement: Part Number male Deutsch/AMP/Metri-Pack test lead. Turn keyswitch "OFF". Disconnect the OEM harness from the accelerator position sensor. Disconnect the OEM harness connector from the ECM. SMALL MEDIUM LARGE Measure the resistance from pin 11 in the OEM harness connector to all other pins in the connector. Measure the resistance from pin 18 in the OEM harness connector to all other pins in the connector. Measure the resistance from pin 19 in the OEM harness connector to all other pins in the connector. NOT More than 100k ohms Repair or replace the OEM harness. Refer to the OEM Troubleshooting and Repair Manual. Go to 3A Guided Step 3 - Check for the ECM response. Page 12 of 15

13 Guided Step 3A - Check for the appropriate ECM response. Disconnect the OEM harness connector from the ECM. Turn keyswitch ON. Read the fault codes using Compulink, Part Number , Echek, Part Number , or INSITE, Part Number Fault Codes 131 inactive, Fault Codes 132 active NOT Replace the ECM. Refer to Procedure Go to 3B Guided Step 3B - Check ECM signal pin resistance. To reduce the possibility of pin and harness damage, use this test lead when taking a measurement: Part Number female Deutsch/AMP/Metri-Pack test lead. Turn keyswitch OFF. Page 13 of 15

14 Disconnect the OEM harness connector from the ECM. Measure the resistance from pin 11 to pin 19 in the ECM OEM port, use test lead, Part Number NOT Less than 100k ohms Replace the ECM. Refer to Procedure Guided Step 4 - Clear the fault code. Guided Step 4A - Disable the fault code. Connect all the components. Start the engine and let it idle for 1 minute. Verify that the Fault Codes 131 is inactive. Fault Codes 131 inactive NOT Return to troubleshooting steps or contact your local Cummins Authorized Repair Location if all Page 14 of 15

15 steps have been completed and checked again. Go to 4B Go to 1A Guided Step 4B - Clear the inactive fault codes. Connect all the components. Erase the inactive fault codes using Compulink, Part Number , Echek, Part Number , or INSITE, Part Number NOT All faults cleared Troubleshoot any remaining active fault codes. Repair complete Appropriate troubleshooting chart Last Modified: 27-Oct-2003 Page 15 of 15