Mazda RX-8 Workshop Manual page 3035

4
Inspect the PCM body ground wiring harness and
ground point.
Are the ground and ground point normal?
INSPECT PCM CONNECTOR TERMINAL
5
Disconnect the negative battery cable.
Disconnect the PCM connector.
Are the PCM connector terminal normal without
damage, deformation, corrosion, or disconnection?
INSPECT PCM
6
Disconnect the PCM connector.
Measure the resistance between the following PCM
connector terminals:
Between terminal 1AM and terminal
1AI (part side)
Is the resistance 118-130 ohm?
VERIFY THAT THERE IS NO OPEN CIRCUIT IN CAN
7
COMMUNICATION WIRING HARNESS
CAUTION:
When inspecting the DLC-2, touch it with a paper
clip or similar thin pin without directly inserting a
tester into the terminals.
Verify the continuity between the following terminals:
Between DLC-2 terminal F and PCM
terminal 1AM
Between DLC-2 terminal F and PCM
terminal 1AI
Is there continuity?
VERIFY THAT THERE IS NO SHORT CIRCUIT IN CAN
8 COMMUNICATION WIRING HARNESS
CAUTION:
When inspecting the DLC-2, touch it with a paper
clip or similar thin pin without directly inserting a
tester into the terminals.
Measure the resistance between the terminals.
Between DLC-2 terminal F and DLC-
2 terminal E
Is the resistance 60 ohm or less?
VERIFY NO SHORT CIRCUIT TO GROUND IN CAN
9
COMMUNICATION WIRING HARNESS
CAUTION:
When inspecting the DLC-2, touch it with a paper
clip or similar thin pin without directly inserting a
tester into the terminals.
Verify the continuity between the following terminals:
Between DLC-2 terminal F and
ground
Between DLC-2 terminal E and
YesGo to the next step.
No Repair or replace the wiring harness, then go to Step 12.
YesGo to the next step.
No Repair the connector terminal if necessary, then go to Step 12.
YesGo to the next step.
No Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION
YesGo to the next step.
No There is an open circuit in the CAN communication wiring
harness. Repair or replace it, then go to Step 12.
YesThere is an open circuit in the CAN communication wiring
harness. Repair or replace it, then go to Step 12.
No Go to the next step.
YesThere is a short circuit to ground in the CAN communication
wiring harness. Repair or replace it, then go to Step 12.
No Go to the next step.
[13B-MSP])