1. Monitor the 5v reference, Gray wire to the Throttle Position Sensor
(TPS) with a Digital Volt Ohm Meter (DVOM) set to the MIN/MAX setting.
2. Monitor the TPS signal circuit, Blue wire with a DVOM. Voltage
should range smoothly from approximately 0.44 to 5.0 volts as the
throttle is opened.
3. Tap test the Electronic Control Module (ECM) and see if the codes come back or if the engine reacts.
possible causes wiring or Powertrain Control Module (PCM)
Does tap test mean what it sounds like??
And isn't the PCM the same thing as the ECM? PCM on 96 and newer and ECM on earlier models?
yes just use the handle of a screw driver and yes
Well the tap didn't work but I did change the ECM..Still no spark. Someone told me there's a fuse under the hood. I can't find it. Is there such a fuse on mine. And yet another person says it has to be the mass air flow sensor. I didn't think that could cause no spark?
Mass air flow sensor could but easy to test just unplug it and try to start it. If it starts you found your problem. The ecm fuse is number 17 should be a 10amp fuse. That is also the fuse for the maf sensor. The ignition module fuse is number 6 should be a 20amp fuse. These fuses should be under the hood in a black box that says relay center on it. The wiring diagram I am looking at also shows a fusible link in the wire to the ecm. to find this you will have to follow the wire from the ecm to the relay center. should be a orange wire with 440 on it. The numbers may have rubbed off over time. There is 2 wires that come from the ecm and combine into 1 both should be orange the fusible link is after where the wire come together.
×
Fig. Fig. 1: Crank angle sensor testing terminals-CA16DE engine
Fig. Fig. 2: Crank angle sensor testing-E16i engine
Fig. Fig. 3: Crank angle sensor testing-CA18DE engine
The "Checking For Spark'' test should be performed prior to this test.
This is a basic test of the ignition system that
systematically examines the battery, the coil, the engine controller,
and its wiring harness and connections; the most likely culprits in a
no-start condition at this stage. Fabricate this special jumper with a 0.33 MF capacitor in-line to test the ignition coil
Click to Enlarge
Terminal locations on the engine controller 14-way connector-1989 models
Click to Enlarge
Engine controller 60-way connector-relevant terminals for testing are shown numbered
Click to Enlarge
The ignition must be turned OFF prior
to unplugging the engine controller connector. If it is not, electrical
surging could occur causing damage to the unit or other electrical
components in the vehicle.
This procedure requires an ohmmeter to test the coil
packs for primary and secondary resistance (specifications are given
for an ambient temperature of 70-80°F/21-27°C). The two coil packs contain five independent coils, which fire paired cylinders (shown numbered)
Click to Enlarge
Location of critical terminals for checking the coil primary resistance-V10 engine front coils
Click to Enlarge
Location of critical terminals for checking the coil primary resistance-V10 engine rear coils
Click to Enlarge
Use an ohmmeter to check secondary resistance as shown
984 views
Usually answered in minutes!
×