Suzuki Samurai/Sidekick/Tracker 1986-1998 Repair Guide

Engine Control Module (ECM)

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OPERATION



See Figures 1, 2, 3 and 4



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Fig. Fig. 1: Engine Control Module (ECM) connector terminal identification-1.3L and 1.6L TFI engines



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Fig. Fig. 2: Engine Control Module (ECM) connector terminal identification-1989-95 1.6L MFI engines



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Fig. Fig. 3: Engine Control Module (ECM) and electronic engine sensor connector terminal identification-1996-98 1.6L MFI engines, and 1.8L engines equipped with the EVAP I system and/or manual transmission



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Fig. Fig. 4: Engine Control Module (ECM) connector terminal identification-1.8L engines equipped with the EVAP II system and/or the automatic transmission

Carbureted Models

See Figure 5

The Engine Control Module (ECM) controls many engine systems, such as the fuel cut system, idle-up system, bowl vent system, EGR system and the secondary throttle valve system, as well as the feedback carburetor system. The ECM utilizes reference signals from various sensors and switches to determine the current condition of the engine, then decides on the proper response. The ECM is located under the glove compartment of the instrument panel.



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Fig. Fig. 5: On carbureted engines, the Electronic Control Module (ECM) is mounted under the right-hand side of the instrument panel, behind the glove compartment

TFI and MFI Models

See Figures 6 and 7

The ECM is a precision unit consisting of one microcomputer chip, an Analog/Digital (A/D) converter, and an Input/Output (I/O) unit. The ECM is an essential component of the electronic control system, and controls all major systems, such as the fuel injectors, idle air control valve, throttle opener solenoid vacuum valve, etc. The ECM also performs on-board self-diagnostic, back-up, and fail safe functions.



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Fig. Fig. 6: The ECM used on fuel injected Samurai models is located behind the glove compartment



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Fig. Fig. 7: The ECM used on Sidekick, Tracker, X-90 and Sidekick Sport models is located under the left-hand side of the instrument panel

The ECM used on Sidekick, Tracker, X-90 and Sidekick Sport models is mounted under the left-hand side of the instrument panel. The ECM used on Samurai models is mounted under the right-hand side of the instrument panel.

REMOVAL & INSTALLATION



Samurai Models

See Figures 5 and 6


WARNING
The ECM is composed of precision parts. Be careful not to expose it to excessive electrical shock.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the glove box to gain access to the ECM.
  4.  
  5. Disengage the wiring harness connectors from the ECM.
  6.  
  7. Loosen the ECM retaining bolts, then remove the unit from the firewall.
  8.  

To install:
  1. Position the ECM on the inner firewall, then install and tighten the retaining bolts until secure.
  2.  
  3. Reattach the wiring harness connectors to the ECM. Ensure that the connector retaining latches are fully engaged.
  4.  
  5. Install the glove box.
  6.  
  7. Connect the negative battery cable.
  8.  

Sidekick, Tracker and X-90 Models

See Figure 7


WARNING
The ECM is composed of precision parts. Be careful not to expose it to excessive electrical shock.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the two screws from the left-hand front speaker cover on the instrument panel.
  4.  
  5. Remove the speaker mounting screws, and remove the speaker.
  6.  
  7. Remove the two bolts and the ECM bracket from the instrument panel support brace.
  8.  
  9. Remove the two screws, and separate the fuse panel from the ECM bracket.
  10.  
  11. Remove the two screws, and remove the ECM from the mounting bracket.
  12.  
  13. Disengage and label the wiring harness connectors from the ECM.
  14.  

To install:
  1. Position the ECM in the vehicle, then reattach the wiring harness connectors to it.
  2.  
  3. Install the ECM against the mounting bracket, then install the retaining screws until snug.
  4.  
  5. Install the fuse panel onto the mounting bracket.
  6.  
  7. Position the ECM bracket on the instrument panel support, then install and tighten the mounting bolts to 15 ft. lbs. (20 Nm).
  8.  
  9. Install the speaker and cover.
  10.  
  11. Connect the negative battery cable.
  12.  

Sidekick Sport Models

See Figures 7 and 8


WARNING
The ECM is composed of precision parts. Be careful not to expose it to excessive electrical shock.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the steering column hole cover plate.
  4.  
  5. Disengage the wiring harness connectors from the ECM.
  6.  
  7. Loosen the ECM retaining bolts, then remove the unit from the mounting bracket.
  8.  



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Fig. Fig. 8: To gain access to the ECM, remove the steering column hole cover plate

To install:
  1. Position the ECM on the mounting bracket, then install and tighten the retaining bolts until secure.
  2.  
  3. Reattach the wiring harness connectors to the ECM. Ensure that the connector retaining latches are fully engaged.
  4.  
  5. Install the steering column hole cover plate.
  6.  
  7. Connect the negative battery cable.
  8.  

 
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