99 flex fuel ranger code 122
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99 flex fuel ranger code 122
code 122 on 3.0 automatic flex fuel ranger. low input switch A tps sensor. I have replaced tps twice and pigtail. Truck idles fine and runs great until under load. Loses power plus doesn't downshift under load . Need help, also what does switch A refer to?
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Joined: Jan 2003
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From: Connecticut
Throttle Position Sensor Circuit P0122
Welcometo FTE!
The TPS sensor circuit is continously monitored (tested) by the PCM for a low throttle position rotation angle (voltage) input. If during Key On Engine Off (KOEO) or Key On Engine Running (KOER) the TP rotation angle (as measured in voltage) falls below a minimum calibrated limit (0.17 volts), the test fails. A P0122 trouble code is stored by the PCM and the CEL is illuminated.
Possible Causes:
- TPS not seated properly
- TPS circuit open to PCM
- VREF open to TPS
- TPS circuit short to GND
- Damaged TPS
- Damaged PCM
Tips for your '99 3.0L:
- GY/WH (Gray wire w/White Stripe) is the TPS circuit to the PCM
- BN/WH (Brown wire w/White Stripe) is VREF
- GY/RD (Gray wire w/ Red Stripe) is GND or SIG RTN
Keep in mind the KOEO voltage between VREF and GND should measure 4-6 volts, otherwise the circuit will be "underpowered" to start with.
HTH
The TPS sensor circuit is continously monitored (tested) by the PCM for a low throttle position rotation angle (voltage) input. If during Key On Engine Off (KOEO) or Key On Engine Running (KOER) the TP rotation angle (as measured in voltage) falls below a minimum calibrated limit (0.17 volts), the test fails. A P0122 trouble code is stored by the PCM and the CEL is illuminated.
Possible Causes:
- TPS not seated properly
- TPS circuit open to PCM
- VREF open to TPS
- TPS circuit short to GND
- Damaged TPS
- Damaged PCM
Tips for your '99 3.0L:
- GY/WH (Gray wire w/White Stripe) is the TPS circuit to the PCM
- BN/WH (Brown wire w/White Stripe) is VREF
- GY/RD (Gray wire w/ Red Stripe) is GND or SIG RTN
Keep in mind the KOEO voltage between VREF and GND should measure 4-6 volts, otherwise the circuit will be "underpowered" to start with.
HTH
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Sean Wiles Sr.
1983 - 2012 Ranger & B-Series
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Oct 22, 2012 10:18 AM
