Scan Tool Does Not Communicate with Power Steering Control Module
SCAN TOOL DOES NOT COMMUNICATE WITH POWER STEERING CONTROL MODULE
| Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
| 1 | Was the Data Link Communications Diagnostic System Check performed? | -- | Go to Step 2 | Diagnostic System Check - Data Link Communications |
| 2 | Attempt to establish communication with the other modules connected to the circuit. * Electronic Brake Traction Control Module (EBTCM) * Heater and A/C Control * SIR Module Does the scan tool communicate with the other modules? |
-- | Go to Step 10 | Go to Step 20 |
| 3 | 1. Disconnect the power steering control module (PSCM) connector. 2. Measure the resistance between the PSCM connector terminal 1 and the data link connector (DLC) terminal 12. Does the resistance measure less than the specified value? |
.5 ohms | Go to Step 5 | Go to Step 6 |
| 4 | 1. Disconnect the EBTCM connector. 2. Attempt to communicate with the other modules. Does the scan tool communicate with the other modules? |
-- | Go to Step 7 | Go to Step 8 |
| 5 | Inspect for poor connections at terminal 1. Refer to TESTING FOR INTERMITTENTS & POOR CONNECTIONS Did you find and correct the poor connection condition? |
-- | Go to Step 9 | Go to Step 11 |
| 6 | Locate and repair an open in CKT XM88 (BRN/WHT). Is the repair complete? |
-- | Go to Step 9 | -- |
| 7 | Replace the EBTCM. Is the replacement complete? |
-- | Go to Step 9 | -- |
| 8 | 1. Reconnect the EBTCM. 2. Disconnect connector C1 from the heater and A/C control. 3. Attempt to communicate with the other modules. Does the scan tool communicate with the other modules? |
-- | Go to Step 12 | Go to Step 13 |
| 9 | Attempt to establish communications with the PSCM. Does the scan tool communicate with the PSCM? |
-- | System OK | -- |
| 10 | 1. Inspect the FLASHER fuse for an open. 2. Inspect and test the PSCM ignition feed circuit at terminal 6 for proper voltage with the KEY ON (11-13 V). 3. Inspect and test the PSCM ground circuit (CKT F88) at terminal 8. 4. Make necessary repairs. Did you find and correct any conditions? |
-- | Go to Step 9 | Go to Step 3 |
| 11 | Replace the PSCM. Is the replacement complete? |
-- | Go to Step 9 | -- |
| 12 | Replace the heater and A/C control. Is the replacement complete? |
-- | Go to Step 9 | -- |
| 13 | 1. Reconnect the heater and A/C control. 2. Disconnect the PSCM connector. 3. Attempt to communicate with the other modules. Does the scan tool communicate with the other modules? |
-- | Go to Step 11 | Go to Step 14 |
| 14 | 1. Reconnect the PSCM. 2. Disconnect the SIR module connector. 3. Attempt to communicate with the other modules. Does the scan tool communicate with the other modules? |
-- | Go to Step 15 | Go to Step 16 |
| 15 | Replace the SIR module. Is the replacement complete? |
-- | Go to Step 9 | -- |
| 16 | 1. Disconnect each module on the serial data circuit (DLC terminal 12). 2. Test the serial data circuit, of the DLC, for a short to ground. 3. Test between terminal 12 and the following terminals at each module: * EBTCM connector terminal 11 * Heater and A/C Control connector C1 terminal 17 * SIR Module terminal 12 * PSCM connector terminal 1 Did you find a short to ground in the serial data circuit? |
-- | Go to Step 17 | Go to Step 18 |
| 17 | Locate and repair the short to ground in the serial data circuit. Is the repair complete? |
-- | Go to Step 9 | -- |
| 18 | Test the serial data circuit, of the DLC, for a short to voltage between terminal 12 and each module. (Turn ON the ignition, leaving the engine OFF, when testing for a short to voltage.) * EBTCM connector terminal 11 * Heater and A/C Control connector C1 terminal 17 * SIR Module terminal 12 * PSCM connector terminal 1 Did you find a short to voltage in the serial data circuit? |
-- | Go to Step 19 | Go to Step 21 |
| 19 | Locate and repair the short to voltage in the serial data circuit. Is the repair complete? |
-- | Go to Step 9 | -- |
| 20 | 1. Turn Off the ignition. 2. Disconnect the scan tool from the data link connector (DLC). 3. Inspect for poor connections/terminal tension at the DLC terminal 12. Refer to TESTING FOR INTERMITTENTS & POOR CONNECTIONS Did you find and correct a poor connection condition? |
-- | Go to Step 2 | Go to Step 4 |
| 21 | Test the serial data circuit, of the DLC, for an open between terminal 12 and each module * EBTCM connector terminal 11 * Heater and A/C Control connector C1 terminal 17 * SIR Module terminal 12 * PSCM connector terminal 1 Did you find an open in the serial data circuit? |
-- | Go to Step 9 | -- |