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Mitsubishi Ignition timing on 1987-96 fuel injected vehicles with timing
adjustment (diagnostic) connectors.
Symptom:
Misfire, loss of power, ping, and other ignition-related problems.
Contributing Source:
Mitsubishi Service Manuals.
The ECU controls ignition timing and advance after base timing is set. To check and adjust
base timing:
1. Make sure the scanner is not connected to the vehicle.
Ground the timing adjustment connector test terminal
with a jumper wire. This puts the system into base
timing mode. The connector usually is taped to a
wiring harness, and may have a protective cap
installed over the end to keep moisture out. Two
styles of connectors have been used, figures 1 and 2.
See table 1 for connector locations. To verify proper
connector, check for 5-volt reference with KOER.
2. After grounding the test terminal, start the engine and check base timing.
3. To adjust base timing:
SOHC engine - loosen distributor retaining nuts; rotate as necessary;
DOHC engine - loosen crank angle sensor retaining nuts; rotate as necessary.
(Sensor located at rear of intake camshaft).
4. After base timing is properly set, tighten the distributor holddown, shut the
engine off, remove the jumper wire from the test terminal and reinstall the
protective cap if used.
Table 1. Timing terminal connector locations.
Model Year Engine
Location
Color
Van/Wagon 87-90 2.4L Above/behind valve cover Black
Galant 87-94 2.OL, 2.4L Bulkhead center Black or Tan
Galant/Sigma 88-90 3.0L LF strut tower, next to coil Black
Montero 89-92 3.0L Left bulkhead, below wiper motor Black
Montero 93-94 3.0L Right bulkhead, below VIN plate Tan
Truck 90-96 2.4L, 3.0L Right fender panel Tan
Mirage 89-92 1.5L, 1.6L Bulkhead center Black
Mirage 93-95 1.5L, 1.8L Bulkhead center Tan
Mirage 87-88 Turbo Bulkhead center Black
Eclipse 90-94 1.8L, 2.0L Bulkhead, near battery Black
Precis 90-94 1.5L Near air flow meter Black
3000 GT 90-94 3.0L Right strut tower, near bulkhead Tan
Starion 87-89 2.6L Bracket, left of center bulkhead Black
Expo/LRV 87-89 1.8L, 2.4L Bracket, left of center bulkhead Tan
Diamante 92-94 3.0L SOHC Bulkhead center Tan
Diamante 92 3.0L DOHC Bulkhead center Tan
