3.0L SEFI SHO and 3.8L SEFI Sc DIS Pinpoint Test Diagnostics Index

13-136 Ignition Systems, Timing Procedures and Diagnostics


3.0L SEFI SHO and

Pinpoint

3.8L SEFI SC DIS

Index

Pinpoint Test Diagnostics

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 operation (ie., engine stall).


[Note]


^ Use a VOM or the 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 13-137


3.0L SEFI SHO and

Pinpoint Test

3.8L SEFI SC DIS

Index

Pinpoint Test Diagnostics