Isuzu 1999 RODEO Workshop Manual page 1932

DTC P0723 Transmission Output Speed Sensor (OSS) Intermittent
Step
1 Were you sent here from the "Powertrain On–Board Diagnostic
(OBD) System Check"?
2 1. Install the scan tool.
2. With the engine "off", turn the ignition switch "on".
NOTE: Before clearing DTC(s), use the scan tool to record "Freeze
Frame" and "Failure Records" for reference, as data will be lost
when the "Clear Info" function is used.
3. Record the DTC "Freeze Frame" and "Failure Records".
4. Raise the drive wheels.
5. Start the engine.
6. Place the transmission in any drive range.
With the drive wheels rotating, does the "Trans Output Speed"
increase with the drive wheel speed?
3 Does the speedometer work?
4 Check for the most current and/or incorrect calibration.
Is the calibration current?
5 1. Turn the ignition "off".
2. Disconnect the C3 (BLUE) PCM connector.
3. Using the J39200 DVOM, measure the resistance between
harness connector terminals C3–E1 and C3–E2.
Is the reading 3,000 ohms?
6 1. Select AC volts.
2. Rotate the rear wheels, ensuring the driveshaft is turning.
Is the voltage greater than 0.5 volts?
7 Inspect circuits YEL and BRN for a poor connection or an open
circuit.
Was a problem found?
8 1. Reconnect the C3 (BLUE) PCM connector.
2. Disconnect the OSS harness from the OSS.
3. With the engine "off", turn the ignition "on".
4. Using the J 39200 DVOM, measure the voltage at the OSS
harness connector terminals M15–1 and M15–2.
Is the reading between 4.0 to 5.1 volts?
9 1. Remove the OSS.
2. Check the output shaft speed sensor rotor for damage or
misalignment. Refer to Speed Sensor (Extension Housing) in
Automatic Transmission (4L30–E) section.
Was a problem found?
10 Replace the OSS.
Is the replacement complete?
11 Was the reading in step 8 less than 4.0 volts?
12 Was the reading in Step 8 greater than 5.1 volts?
13 Using the J 39200 DVOM to chassis ground, measure the voltage
on circuit YEL.
Is the reading between 4.0 to 5.1 volts?
TRANSMISSION CONTROL SYSTEM (4L30–E)
Action Yes
Go to OBD
System Check
Driveability and
Emissions in
Go to Step 2
Engine section
Go to Diagnostic
Go to Step 3
Aids
Go to Step 4 Go to Step 5
Go to Step 17 Go to Step 5
Go to Step 6 Go to Step 7
Go to Step 8 Go to Step 9
Go to Step 18 Go to Step 9
Go to Step 17 Go to Step 11
Go to Step 18 Go to Step 10
Go to Step 18
Go to Step 13 Go to Step 12
Go to Step 16
Go to Step 14 Go to Step 15
7A1–53
No
Refer to
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