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404
TM 9-2320-312-24-2
Troubleshooting Section
Expected Result:
Expected Result:
The wires from the ECM to the tachometer are
The "Tachometer Calibration" matches the ECM
undamaged.
tachometer calibration.
Results:
Results:
OK The tachometer is correctly calibrated.
OK The wiring is OK. Proceed to Test Step 7.
Not OK The wiring is damaged.
Repair: Perform the following repair:
1. If the tachometer is correctly calibrated but
Repair: Perform the following repair:
the tachometer does not work, replace the
tachometer or send the tachometer to the OEM
Either repair the wiring or send the vehicle to the
dealer for repair.
OEM dealer. Verify that the repair eliminates the
problem.
2. Verify that the repair eliminates the problem.
STOP.
STOP.
Test Step 7. Check the Tachometer
Battery Supply Voltage.
Not OK The tachometer is not correctly
calibrated.
A. Connect the tachometer lines to the ECM and
Repair: Perform the following repair:
the tachometer.
B. Check the +Battery connections and the -Battery
1. Calibrate the tachometer in order to match
the ECM.
connections to the tachometer. Include the fuses
and the circuit protection.
a. If the tachometer calibration is known and
the tachometer calibration is within 12.0 to
Expected Result:
500.0 pulses per revolution, change the
Customer Programmable Parameter of the
The tachometer is receiving the correct battery
ECM "Tachometer Calibration" in order to
supply voltage.
match the tachometer.
Results:
2. Verify that the repair eliminates the problem.
OK The battery supply voltage is OK.
STOP.
Repair: Perform the following repair:
Test Step 6. Check the ECM Connection
to the Tachometer.
If the tachometer is receiving the correct battery
supply voltage but the tachometer does not work,
A. Find the tachometer signal connections to the
replace the tachometer or send the tachometer to
tachometer.
the OEM dealer for repair.
B. Disconnect the wires from the ECM to the
STOP.
tachometer at the ECM connector and at the
tachometer.
Not OK The battery supply voltage is incorrect.
Refer to Illustration 177.
Repair: Perform the following repair:
C. Check for continuity through the wires to the
1. Repair the wiring for the battery supply.
ECM connector P1:39 (Tachometer-) and P1:38
(Tachometer+).
2. Verify that the repair eliminates the problem.
Note: Some of the tachometers require only one
STOP.
signal line to be connected. Either of the ECM
terminals can be used for this type of tachometer.
The other wire should be left disconnected. If both
wires are connected, and one indicates an open
circuit, repair this line.

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