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P2138-ACCELERATOR PEDAL POSITION SENSOR 1/2 CORRELATION (CONTINUED) 8. CHECKING APPS NO.1 AND NO.2 WITH A LAB SCOPE Ignition on, engine not running. Set up a lab scope in a way that you can view two graphs simultaneously. Backprobe (K23) APP Sensor No.1 Signal circuit using Channel 1 at the APP Sensor harness connector. Backprobe (K29) APP Sensor No.2 Signal circuit using Channel 2 at the APP Sensor harness connector. Slowly press and release the Accelerator Pedal while monitoring the lab scope screen. Does the scope pattern show any missing or erratic signals? Yes >> Replace the APP Sensor Assembly per Service Information. After installation is complete, use a scan tool and select the ETC RELEARN function to relearn the APPS values. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 9 9. PCM NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal Were there any problems found? Yes >> Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Replace and program the Powertrain Control Module per Service Information. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 9 - 956 ENGINE ELECTRICAL DIAGNOSTICS WK |