Code help needed
#1
#2
A much better definition of codes here: Fuel Injection Technical Library » 2 Digit Self-test Codes 11-32
DTC 21: ECT out of self test range 0.3 to 3.7 volts.
DTC 24: ACT sensor out of self test range 0.3 to 3.7 volts.
The most common cause of those codes is not warming up the engine before running the Key On Engine Off (KOEO) tests.
DTC 22: MAP sensor out of self test range.
DTC 23: Closed throttle TPS voltage higher or lower than expected.
Your poor engine performance is probably related Code 22 and 23. If you have replace the MAP sensor and TPS before then it is time to start checking wires and signal output.
For reference:
Fuel Injection Technical Library » Engine Coolant Temperature Sensor (ECT)
Fuel Injection Technical Library » Air Charge Temperature (ACT)
Fuel Injection Technical Library » Manifold Absolute Pressure Sensor (MAP)
Fuel Injection Technical Library » Throttle Position Sensor (TPS)
DTC 21: ECT out of self test range 0.3 to 3.7 volts.
DTC 24: ACT sensor out of self test range 0.3 to 3.7 volts.
The most common cause of those codes is not warming up the engine before running the Key On Engine Off (KOEO) tests.
DTC 22: MAP sensor out of self test range.
DTC 23: Closed throttle TPS voltage higher or lower than expected.
Your poor engine performance is probably related Code 22 and 23. If you have replace the MAP sensor and TPS before then it is time to start checking wires and signal output.
For reference:
Fuel Injection Technical Library » Engine Coolant Temperature Sensor (ECT)
Fuel Injection Technical Library » Air Charge Temperature (ACT)
Fuel Injection Technical Library » Manifold Absolute Pressure Sensor (MAP)
Fuel Injection Technical Library » Throttle Position Sensor (TPS)
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#9
The links I posted before lists the expected values at different operating conditions. You will need a Voltmeter to test the TPS. Testing the MAP is a little more involved because the output is a frequency not a varying voltage. I have a Digital Voltmeter (DVM) that can measure voltage and frequency (as well as resistance).
As noted previously the MAP sensor is a key input to the PCM for controlling the engine and transmission, if it is an electronic controlled version such as an E4OD.
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justin_brandstein
1987 - 1996 F150 & Larger F-Series Trucks
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03-29-2009 07:39 PM