1991 MITSUBISHI MONTERO Service Manual

Fig. 227: Flow Chart DR-16 (1.8L) (2 of 5)

Fig. 228: Circuit Diagram DR-16 (1.8L)

Fig. 229: Flow Chart DR-16 (1.8L) (3 of 5)
Fig. 230: Circuit Diagram DR-16 (1.8L)

Fig. 231: Flow Chart DR-16 (1.8L) (4 of 5)

Fig. 232: Flow Chart DR-16 (1.8L) (5 of 5)
DR-17: PURGE SOLENOID - 1.8L
Fig. 233: Circuit Diagram DR-17 (1.8L)

Fig. 234: Flow Chart DR-17 (1.8L)
DR-18: NO FAULT CODE MECHANICAL TEST - 1.8L
At this point in the driveability test procedure, you have
determined that all of the engine control systems are operating as
they were designed to. Therefore, they are not the cause of the
driveability problem.
The following additional items can not be overlooked as
possible causes of a driveability problem.
1. THROTTLE VALVE AREA - Dirt or ice buildup causing rough idle and
stalling.

2. ENGINE IGNITION TIMING - Must be set with timing terminal
grounded.
3. ENGINE VACUUM - Must be normal for your altitude.
4. ENGINE VALVE TIMING - To specifications.
5. ENGINE COMPRESSION - To specifications.
6. ENGINE P.C.V. SYSTEM - Must flow freely.
7. ENGINE EXHAUST SYSTEM - Must be free of any restrictions.
8. POWER BRAKE BOOSTER - No internal vacuum leaks.
9. TORQUE CONVERTER CONDITION - May cause very low power at breakaway
or high speed (Only 1 condition at a time).
10. FUEL CONTAMINATION - High alcohol or water content.
11. FUEL INJECTORS - Rough idle may be caused by injector wiring not
connected to correct injector.
12. ENGINE SECONDARY IGNITION CHECK - Abnormal scope patterns.
13. TECHNICAL SERVICE BULLETINS - Any that apply to vehicle.
14. All air intake piping and vacuum hoses must be in place and
secure. The proper air filter element must be used.
15. FUEL PRESSURE - Must be correct.
Specification: With no vacuum at the regulator:
48 PSI on V6 & non-turbo 4 Cyl. engines
36 PSI on turbo engines
NS-1: IGNITION CHECK FLOW CHARTS - 2.0L
Fig. 235: NS-1 Flow Chart & Circuit Diagram (2.0L) (1 of 5)

Fig. 236: NS-1 Flow Chart & Circuit Diagram (2.0L) (2 of 5)