Mitsubishi Montero (1991+). Manual - part 218

Rear Wiper/Washer Circuit

G - TESTS W/CODES 



1991 Mitsubishi Montero

         1990-91 ENGINE PERFORMANCE

         Chrysler Motors/Mitsubishi Self-Diagnostics

         Dodge; Colt, Colt Vista, Colt Wagon

         Eagle; Summit

         Mitsubishi; Eclipse, Galant, Mirage, Montero, Precis (1990)

         Plymouth; Colt, Colt Vista, Colt Wagon

         INTRODUCTION

         If no faults were found while performing F - BASIC TESTING,

proceed with self-diagnostics. If no fault codes or only pass codes

are present after entering self-diagnostics, proceed to H - TESTS W/O

CODES article for diagnosis by symptom (i.e. ROUGH IDLE, NO START,

etc.).

         SELF-DIAGNOSTIC SYSTEM

         Use Chrysler Motors code charts when using Chrysler’s

Diagnostic Readout Box (DRB-II). If DRB-II is not available or if

working on a Mitsubishi Motors vehicle, system diagnosis can only be

accomplished using a voltmeter or appropriate scan tester. To diagnose

Chrysler Motors and Mitsubishi models using a voltmeter, see

ENTERING ON-BOARD DIAGNOSTICS (USING VOLTMETER)  in this article.

         SYSTEM DIAGNOSIS

         SYSTEM DIAGNOSIS DESCRIPTION

NOTE:    Chrysler Motors recommends using DRB-II to diagnose system.

         Voltmeter usage has limited diagnostic capabilities but can

         be used if DRB-II is not available or if working on a

         Mitsubishi Motors vehicle.

         The Engine Control Unit (ECU) monitors several different

engine control system circuits. If an abnormal input signal occurs, a

fault code is stored in ECU memory and given a fault code number. Each

circuit has its own fault number and message. A specific fault code

indicates a particular system failure, but it DOES NOT indicate that

cause of failure is necessarily within system. A fault code DOES NOT

condemn any specific component; it simply points out a probable

malfunctioning area. If a critical fault code is set, the ECU will

turn on CHECK ENGINE light. All fault codes except speed sensor are

considered critical.

         Fault codes can be confirmed by using a voltmeter on Chrysler

Motors and Mitsubishi models or Chrysler’s Diagnostic Readout Box

(DRB-II) on Chrysler Motors vehicles. See

ENTERING ON-BOARD DIAGNOSTICS (USING VOLTMETER)  or ENTERING ON-BOARD

DIAGNOSTICS (USING DRB-II) in this article. By using the DRB-II, the

self-diagnostic capabilities of this system can simplify testing and

reduce diagnostic time.

         System malfunctions encountered are identified as either hard

failures or intermittent failures as determined by the ECU.

         HARD FAILURES

         Hard failures cause CHECK ENGINE light to illuminate and

remain on until the malfunction is repaired. If light comes on and

remains on (light may flash) during vehicle operation, cause of

malfunction must be determined by using DIAGNOSTIC FAULT CHARTS (if

testing with voltmeter) or diagnostic CODE CHARTS (if testing with

DRB-II). If a sensor fails, ECU will use a substitute value in its

calculations to continue engine operation. In this condition, vehicle

is functional, but loss of good driveability may result.

         INTERMITTENT FAILURES

         Intermittent failures may cause CHECK ENGINE light to flicker

or illuminate and go out after the intermittent fault goes away.

However, the corresponding trouble code will be retained in ECU

memory. If related fault does not reoccur within a certain time frame,

related trouble code will be erased from ECU memory. Intermittent

failures may be caused by a sensor, connector or wiring related

problems. See INTERMITTENTS in H - TESTS W/O CODES article.

         PRETEST INSPECTION

         Before proceeding with diagnosis, the following precautions

must be followed:

      *  Vehicle must have a fully charged battery and functional

         charging system.

      *  Visually inspect connectors and circuit wiring being worked

         on.

      *  DO NOT disconnect battery or ECU. This will erase any fault

         codes stored in ECU.

      *  DO NOT cause short circuits when performing electrical tests.

This will set additional fault codes, making diagnosis of original

problem more difficult.

      *  DO NOT use a test light in place of a voltmeter.

      *  When checking for spark, ensure coil wire is NO more than

         1/4" from ground. If coil wire is more than 1/4" from ground,

         damage to vehicle electronics and/or ECU may result.

      *  DO NOT prolong testing of fuel injectors. Engine may

         hydrostatically (liquid) lock.

      *  When a vehicle has multiple fault codes, always repair lowest

         number fault code first.

      *  If DRB-II is being used to diagnose system, always perform

         verification test after repairs are made.

         ENTERING ON-BOARD DIAGNOSTICS (USING VOLTMETER)

         1) Before entering on-board diagnostics, refer to PRETEST

INSPECTION in this article. Turn ignition switch to OFF position.

Locate self-diagnostic connector. See SELF-DIAGNOSTIC TEST CONNECTOR

LOCATION table. Using an analog voltmeter, connect voltmeter positive

lead to self-diagnostic connector terminal No. 1 and negative lead to

terminal No. 12 (ground). See Fig. 6.

         2) Turn ignition switch to ON position and disclosure of ECU

memory will begin. If 2 or more systems are non-functional, they are

indicated by order of increasing code number. Indication is made by

12-volt pulses of voltmeter pointer. A constant repetition of short

12-volt pulses indicates system is normal. If system is abnormal,

voltmeter will pulse between zero and 12 volts.

         3) Signals will appear on voltmeter as long and short 12-volt

pulses. Long pulses represent tens; short pulses represent ones. For

example 4 long pulses and 3 short pulses indicates Code 43. See

Figs. 1 and 2. After recording abnormal code(s), perform necessary

repair.

         4) After repair, turn ignition off and disconnect negative

battery cable for 10 seconds to erase ECU memory. Reconnect power

supply and repeat self-diagnostics to confirm repair.

SELF-DIAGNOSTIC TEST CONNECTOR LOCATION TABLE

Application                                         Location

Colt, Colt 200, Colt Wagon & Summit

  1.5L  ................................  Next to fuse block

  1.6L  ..................................  Right kick panel

Colt Wagon & Colt Vista

  1.8L & 2.0L SOHC  ....................  Next to fuse block

Eclipse  ...............................  Next to fuse block

Galant  ...................................  Left kick panel

Mirage  ...................................  Left kick panel

Montero  ..........................  Inside top of glove box

Precis  ...................................  Left kick panel

Fig. 1:  Diagnostic Fault Chart (1 of 2)

Courtesy of Mitsubishi Motor Sales of America.