Ignition - Digital Meter Use With Pinpoint Tests

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Bulletin No.: 017/92
Issued: 3/24/92


Category
F


Applicable Model/s:
1991-'92 Navajo


Subject:
USAGE FOR PINPOINT TESTS


DESCRIPTION

The Ignition Pinpoint Test described in the 1991-'92 Workshop Manual requires the use of an "averaging" type digital volt-ohm meter. The following make/model ohm meters are accurate test instruments: Fluke 88, Fluke 20 or 70 series, etc.

Some digital volt-ohm multimeters cannot be used with the Ignition Pinpoint Test (Workshop Manual, Section F) because they can display incorrect voltage readings that may lead to misdiagnosis and/or unnecessary parts replacement.


TESTING PROCEDURE

To determine if the digital volt-ohm meter you are using is compatible with the Ignition Pinpoint Test, perform the following test procedure:

1. Using a known good electronic distributorless ignition system (EDIS):

a. Install the proper EDIS diagnostic cable (49 UN01 057).

b. Connect the electronic engine control (EEC) breakout box (49 UN01 058) to the cable.

2. Start the engine. The battery should be charged and the engine must be idling between 700 and 900 rpm.

3. Measure the A/C voltage between coil drive C1 and ground. The voltage should be between 1.0 and 2.0 volts.

4. Measure the A/C voltage between the profile ignition pickup (PEP) jack and ground. The voltage should be between 6.0 and 8.0 volts.

If both of the above readings are within the specifications, the digital volt-ohm meter you are using is compatible with the Ignition Pinpoint Test.