ECM trouble

Tiny
ALFRED
  • MEMBER
  • 1997 NISSAN TRUCK
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 161,000 MILES
I have a 97 nissan truck that stopped running.I checked fuel pump, ignition fire, timing all good.I tested injectors for pulse nothing. Put in new ecm got pulse back but still wont start and lost pulse to injectors. What can it be?
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Tuesday, February 1st, 2011 AT 12:45 AM

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Tiny
BMRFIXIT
  • EXPERT
Prior to replacing the ecm wiring need to be checked

use an ohm meter and check all wiring for open and short
check relays and fuses

Using an ohmmeter, check for continuity to ground on ECM terminals No. 10, 19, 39, 43, 50, 106, 112 and 118. See Fig. Below
Resistance should be zero ohms.
If resistance is not zero ohms, repair open to ground.
Using a DVOM, touch negative lead of voltmeter to a good ground. Using positive lead of voltmeter, backprobe each ground terminal at ECM connector.
With vehicle running, voltmeter should indicate less than one volt. If voltmeter reading is greater than one volt, check for open, corrosion or loose connection on ground lead.

Turn ignition switch to ON position.
Using a voltmeter, check for battery voltage between chassis ground and ECM terminals No. 38, 56 and 61.
If battery voltage is not present, check fusible link and fuse "G".
Turn ignition switch to OFF position.
Using a voltmeter, check for battery voltage between chassis ground and ECM power back-up terminal No. 70.
If battery voltage is not present, check for overheated relays, fusible links and wiring.
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Tuesday, February 1st, 2011 AT 2:28 AM

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