121

Possible Causes

• •Intermittent problem
• •TPS1 or TPS2 signal shorted to ground in harness
• •Faulty ECM connection
• •Faulty ECM
• •Faulty harness
• •Intermittent Problem

Suggested Actions

1. 1Perform the On-Board (OBD) System Check.
2. 2Enable DBW Test mode and slowly depress FPP sensor (or type desired throttle opening % in the TPS Command box) to sweep throttle and check TPS1 and TPS2 calibration.
3. 3Disconnect throttle from harness and verify if voltage for both TPS1 and TPS2 is less than 0.100 VDC.
4. 4Connect TPS1 and TPS2 signal to the 5V reference at throttle connector and verify if DST displays voltage over 4.90 VDC.
5. 5Disconnect wire harness header from ECM, remove yellow lock, and check resistance between MAP input at ECM header and signal at device (ensuring not to spread the terminals with the probe).
6. 6Repair or replace faulty harness.
7. 7Repair faulty ECM connection or replace faulty ECM.
8. 8Perform the On-Board (OBD) System Check
9. 9Key ON, Engine Off, System Mode = 'Stopped', Enable 'DBW Test' mode, slowly depress FPP sensor (or type desired throttle opening % in the TPS Command box on DBW page) and check for TPS1 and TPS2 calibration differences
10. 10Disconnect throttle from harness and measure voltage for both TPS1 and TPS2 to verify if <0.100 VDC
11. 11Connect TPS1 signal to the 5V reference at throttle connector while observing TPS1 voltage, repeat for TPS2, and check if DST displays voltage over 4.90 VDC
12. 12Disconnect wire harness header from ECM, carefully remove yellow lock from header at device output terminal, and check resistance between MAP input at ECM header and signal at device (avoid inserting probe directly into terminals to prevent spreading pins)

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