armymech4

I had a mess of a problem with almost nothing working. Fuel pump ran all the time. Injectors pulsed with key on. No dash function. I replaced the ecu and gained all normal function back. Just no spark. I have the ASD circuit HotWired. Am not getting pulse from pin 7 of connector 1 on ecu. I did the cps test across pin b and c. OL. I'm kinda stuck. Hoping the ignition module on the ecu isn't bad. Bit replacing that gave normal function to all except spark. Fuel pump primes for 4 secs

CCKen

What year is this Heep?

CCKen

"Am not getting pulse from pin 7 of connector 1 on ecu"

Where, and how, are you determining this?

armymech4

97 country. OHM check with beep signal back probed to pin 7 with other lead to ground. Also stuck a power probe as it should flash green during a pulse

armymech4

Pin 7 is the coil driver. Continuity between said pin and coil check good. Have not verified cks signal as all I had time to do was the resistance check of pin b and c of cks. Will check in a few.

armymech4

Unplugging the cks and plugging back in tripped a code. Most likely the cks.still verifying as I hate swapping parts and I have the time now

93gc40

Yeah, you first step should have been to test the CkPS. As that is the #1 cause of no ignition pulses. next step would be checking the CPS. CPS signal triggers CkPS which triggers your pin 7.

armymech4

I did an ohms check of pin b and c. Checked good. Which caused me to move on

CCKen

When you say you have the ASD circuit 'hot wired' does this mean you jumpered pin cav 30 to 87 in the ASD relay base (which, BTW, is not recommended by the FSM)?

If so, this should have bypassed the Crankshaft Position Sensor input signal to the PCM.

armymech4

Yes 30 to 87 is jumped. ASD output. Don't see how that would bypass the signal? As when relay is energized it sends 12 volts to output which goes to coil and 02 sensors according to the schematic I have

CCKen

The ASD relay control coil is operated by the PCM when it receives a signal from the Crankshaft Position Sensor that the engine is rotating. The PCM ignition coil driver is timed by the Camshaft Position Sensor to fire a plug (and pulse a fuel injector) when the cam sensor determines that the piston is in position to fire.

Jumpering the ASD power contacts (30-87) bypasses the relay control coil (86-85) action to pull the power contacts closed.

It must be determined if the Ignition Coil Driver circuit wire (Gray wire) from the PCM, connector C1, pin A7, is intact and has continuity and very low resistance (5 Ohms max). Unplug PCM C1 and the Ignition Coil connector. Read the resistance between C1/A7 and the coil connector pin cavity 2 (Gray wire). Do not back probe these pins with the connectors attached. Use a high quality digital Ohmmeter. Do not use a circuit tester light or buzzer device for this. Have the battery negative post disconnected.

armymech4

0 ohms

CCKen

Read (Resistance) between the Gray wire pin cavity on the coil connector to engine ground, and do the same for C1/A7 to ground. See if the wire is chafed to ground. Continuity readings would show this. If both read open I would assume that wire is good.

Are you sure your fuel injector ground drivers are working?

armymech4

More info on the ecu replacement. It was not flashed to my Vin and miles. Maybe that has something to do with the drivers? Ecu was pulled from same year and model. Ohms check from pin 7 to ground. Is 112k ohms. Way too high

armymech4

I have injector pulse