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No injector pulse.


RonD

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Oops :)

Thinking 2.9l

Previous post applies for computer interface but PIP comes from ICM(ignition control module) on the front of lower intake, PIP comes from Crank Sensor, instead of distributor sensor, to the ICM.
And PIP is sent from ICM to computer so it can start injectors, and SPOUT is sent back to ICM
 
Last edited:


RB7 Ranger

RB7 Ranger

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BOTH SCREWS MUST BE IN ICM FOR GROUNDING!

1. Backprobe the Dark Blue (DB) wire at ICM pin 4 and read the Key On, Engine Off (KOEO) voltage.
The voltage should indicate battery voltage or read less than 0.5 volts.

2. Bump-crank the engine over and retake the reading of the DB wire to see if it indicates a change of voltage to the opposite extreme of battery or 0 volts.

3. If the reading is always low, verify battery voltage is present on the Red/Light Green (RD/LG) wire of the CKP sensor with the key in the Run position, and check for an open or short to ground between the CKP sensor and the ICM.

4. If the reading is always high, verify that the Black/Orange (BK/O) wire of the CKP sensor indicates to be a good ground and that the DB wire is not shorted to a power circuit or open between the sensor and the ICM.

5. If the circuits are OK, but the reading on the DB wire is not changing, replace the defective replacement CKP sensor.

6. If the DB wire is changing high to low as it should, monitor the Tan/Orange (TN/OR) wire and Tan/Red (TN/RD) wire of the ICM with a test light connected to a power source to identify if the Tan wires are triggered by the ICM when cranking to verify that the replacement ICM is OK.
This test needs to be performed with the ICM connected.

Tech Tips: The CKP sensor creates a 0 to battery voltage square wave signal on the DB wire as the engine cranks or runs for the ICM to trigger the coil. The ICM in turn, generates a 0 to battery voltage square wave signal on the DB wire at ICM pin 3 so that the PCM receives an RPM signal for triggering injection and running the fuel pump.
 
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