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EN(H4DOTC)(diag)-157 ENGINE (DIAGNOSTICS) Diagnostic Procedure with Diagnostic Trouble Code (DTC) AX:DTC P0638 THROTTLE ACTUATOR CONTROL RANGE/PERFORMANCE (BANK 1) NOTE: AY:DTC P0700 TRANSMISSION CONTROL SYSTEM (MIL REQUEST) NOTE: 2 CHECK INPUT VOLTAGE OF ECM. Connector & terminal (B135) No. 5 (+) — Chassis ground ( − ): (B135) No. 6 (+) — Chassis ground ( − ): Is the voltage 13 — 15 V? Repair the open or 3 CHECK ECM GROUND HARNESS. Connector & terminal (B137) No. 1 (+) — Chassis ground ( − ): (B137) No. 2 (+) — Chassis ground ( − ): Is the voltage less than 1 V? Repair the poor Further tighten the Step Check Yes No |