Subsection 01 (ELECTRONIC FUEL INJECTION (EFI))
TEST RESULT
READING
RESULT
Approximately
60
ECM and CLUSTER CAN wires
and resistors good
Approximately
120
ECM CAN resistor open, or
CLUSTER CAN resistor
open, or
CAN wire to CLUSTER
or ECM open
Infinite
(open circuit)
CAN wire to DB connector
open circuit
If 120 ohms is read, isolate the CLUSTER from
CAN by disconnecting it and measuring again at
the diagnostic link connector.
If 120 ohms is still read, the ECM CAN resistor and
wires are good. Check for continuity of the CLUS-
TER CAN wires, refer to
WIRING DIAGRAM
.
If an open circuit is read, the ECM CAN resistor
(or wire) is open. Check for continuity of the ECM
CAN wires, refer to
WIRING DIAGRAM
to deter-
mine if the wires or the resistor is at fault.
If the CAN resistor of a module is at fault, replace
that module.
If a module cannot communicate and the CAN re-
sistor and wires test good, try a new module.
5. Reconnect DPS1 to DPS module,
Removing the ECM
NOTE:
If a new ECM is to be installed, first read
the procedures in
REPLACING THE ECM
in this
subsection.
1. Disconnect battery cables.
NOTICE
Always disconnect the BLACK (–)
battery cable first, then disconnect RED (+)
cable.
2. Disconnect ECM connector.
3. Unscrew all retaining screws and pull out ECM.
Installing the ECM
Reverse removal procedure however, pay atten-
tion to the following.
1. Reconnect ECM connector.
2. Reconnect battery cables.
WARNING
Always reconnect the RED (+) battery cable
first, then reconnect BLACK (–) cable.
3. If a new ECM is installed, refer to
REPLACING
THE ECM
in this subsection.
Replacing the ECM
1. Transfer ECM data.
Refer to
ECM DATA
TRANSFER
for complete procedure.
2. Perform the
CLOSED THROTTLE AND IDLE
ACTUATOR RESET
.
3. Program the vehicle ignition key(s) in the new
ECM.
4. Calibrate the IACV. Refer to
IACV CALIBRA-
TION
in this subsection.
ECM Data Transfer
To transfer the original ECM recorded information
to the new ECM, use the B.U.D.S. software and
proceed as follows.
1. Connect the original ECM to vehicle.
2. In B.U.D.S., click the Read Data button to load
the information from the original ECM.
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NOTE:
Keep B.U.D.S. running while replacing
ECMs. The data will remain stored in the PC
computer as long as B.U.D.S. is running.
3. Get the Data from the saved .mpem file.
3.1 Click on the Open button.
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3.2 Click once on the Folder Up button in the
open box.
6
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