1991 MITSUBISHI MONTERO Service Manual

Fig. 293: DR-20 Flow Chart & Circuit Diagram (2.0L) (1 of 2)

Fig. 294: DR-20 Flow Chart & Circuit Diagram (2.0L) (2 of 2)
DR-21: NO-FAULT CODE TEST, DRB-II SENSOR TEST - 2.0L

Fig. 295: DR-21 Flow Chart & Circuit Diagram (2.0L) (1 of 5)

Fig. 296: DR-21 Flow Chart & Circuit Diagram (2.0L) (2 of 5)

Fig. 297: DR-21 Flow Chart & Circuit Diagram (2.0L) (3 of 5)

Fig. 298: DR-21 Flow Chart & Circuit Diagram (2.0L) (4 of 5)

Fig. 299: DR-21 Flow Chart & Circuit Diagram (2.0L) (5 of 5)
DR-22: NO-FAULT CODE MECHANICAL TEST - 2.0L
At this point in the driveability test procedure you have

determined that all of the engine controls systems are operating as
they were designed to. Therefore, they are not the cause of the
driveability problem. The following additional items should be checked
as possible causes:
1) ENGINE VACUUM - Must be at least 13 inches in neutral.
2) ENGINE VALVE TIMING - Set to specifications.
3) ENGINE COMPRESSION - To specifications.
4) EXHAUST SYSTEM - Free from any restrictions.
5) PCV SYSTEM - Must flow freely.
6) DRIVE SPROCKETS - Camshaft and crank shaft.
7) TORQUE CONVERTER STALL SPEED - To specifications.
8) POWER BRAKE BOOSTER - No internal vacuum leak.
9) FUEL CONTAMINATION - High alcohol and water content.
10) FUEL INJECTORS - Rough idle may be caused by injector
control wire not connected to correct injector.
11) TECHNICAL SERVICE BULLETINS - Any that may apply to
vehicle.
12) ENGINE SECONDARY IGNITION CHECK - Any abnormal scope
pattern.
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
DR-VER: DRIVEABILITY VERIFICATION TEST - 2.0L
Fig. 300: DR-VER Flow Chart (2.0L)
SUMMARY