2.3L EFI Truck (Dual Plug) DIS Pinpoint Test Diagnostics
13-88 Ignition Systems, Timing Procedures and Diagnostics2.3L EFI Truck (Dual Plug) DIS Pinpoint
Index
Pinpoint Test Diagnostics Test
Figure 1:
CAUTION
A 12 volt Test Lamp should not be used to test circuit signals. It will load the circuit and may cause erroneous measurements or improper DIS/EEC-IV operations (ie. Engine stall).
Note
^ Use VOM or LED test lamp circuit (Figure 1) in the following pinpoint test procedures. The LED test lamp is more convenient and faster to use.
^ If a VOM is used, correct Test Lead Polarity must be followed. The red lead is (+) positive and the black lead is (-) negative.
^ To check PIP or CID, the engine is "Bumped" with the starter while watching the voltmeter. Both the CID and PIP signals are digital and should switch between VBAT and ground as the engine turns. To see the signal change using the VOM, the engine must be turned in very short bursts.
^ If an LED Test Lamp is used, wire the LED as shown below:
Ignition Systems, Timing Procedures and Diagnostics 13-89
2.3L EFI Truck (Dual Plug) DIS Pinpoint
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Pinpoint Test Diagnostics Test