|
|
7A1–48 TRANSMISSION CONTROL SYSTEM (4L30–E) DTC P0722/Flashing Code 78 Transmission Output Speed Sensor (OSS) Low Step Action Yes No 1 1. Install the scan tool. NOTE: Before clearing DTC(s), use the scan tool to record “Failure 3. Record the DTC “Failure Records”. With the drive wheels rotating, does the “Trans Output Speed” Go to Diagnostic Aids Go to Step 2 2 Does the speedometer work? Go to Step 3 Go to Step 4 3 Check for the most current and/or incorrect calibration. Is the calibration current? Go to Step 16 Go to Step 4 4 1. Turn the ignition “off”. harness connector terminals C3–E1 and C3–E2. Is the reading 3000 ohms? Go to Step 5 Go to Step 6 5 1. Select AC volts. Is the voltage greater than 0.5 volts? Go to Step 7 Go to Step 8 6 Inspect circuits YEL and BRN for a poor connection or an open Was a problem found? Go to Step 17 Go to Step 8 7 1. Reconnect the C3 (BLUE) PCM connector. harness connector terminals M15–1 and M15–2. Is the reading between 4.0 to 5.1 volts? Go to Step 16 Go to Step 10 8 1. Remove the OSS. misalignment. Refer to Speed Sensor (Extension Housing) in Was a problem found? Go to Step 17 Go to Step 9 9 Replace the OSS. Is the replacement complete? Go to Step 17 — 10 Was the reading in step 8 less than 4.0 volts? Go to Step 12 Go to Step 11 11 Was the reading in Step 8 greater than 5.1 volts? Go to Step 15 — 12 Using the J 39200 DVOM to chassis ground, measure the voltage Is the reading between 4.0 to 5.1 volts? Go to Step 13 Go to Step 14 13 Repair the open in circuit BRN. Is the repair complete? Go to Step 17 — 14 Check circuit YEL for a short to ground or open. Was a problem found and corrected? Go to Step 17 Go to Step 16 |