8206code.fm Page 85 Tuesday, July 7, 1998 11:57 AM
DIAGNOSTIC CODE 3-5 (BASIC) Test 1
Test 2
Checking timing control
Checking for oil pressure from the deenergized timing control valve to the ECONOVANCE
1. Connect a diagnostic tool (Pro-Link 9000 or PC) and select the monitoring mode to display engine timing status. 2. Run the engine at low idle for at least 30 seconds and record the timing status. 3. Run the engine at high idle and record the timing status.
If the timing status at both low and high idle is correct (the diagnostic tool will indicate that timing is OK), the timing is working properly under these conditions. If the complaint indicates that the timing fault was active recently, it may be necessary to recreate the situation in which the timing fault occurred for this diagnostic procedure to be effective. If the timing status is too advanced (the diagnostic tool will display “++”) or too retarded (the tool will display “--”), proceed to Test 2.
Figure 137 — Oil Pressure Check (Timing Control Valve)
1. Turn the ignition key to the OFF position. 2. Disconnect the timing control valve at the wiring harness. 3. Remove the cap from the diagnostic port located on top of the timing control valve. 4. Connect a pressure gauge to the diagnostic port. 5. Start the engine and record the low idle oil pressure displayed on the gauge.
If the oil pressure on the gauge is 0, proceed to Test 4. If the pressure on the gauge is not 0, proceed to Test 5.
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