DTC U210B: Lost Communication Between Fuel Pump Control Module And Restraints Control Module

U210B - LOST COMMUNICATION BETWEEN FUEL PUMP CONTROL MODULE AND RESTRAINTS CONTROL MODULE

Description:	The fuel pump control module monitors the duty cycle and frequency of the signal it receives from the restraints control module (RCM). The fuel pump control module determines if the signal on the event notification signal (ENS) circuit from the RCM is a valid duty cycle and frequency. If the duty cycle or frequency is invalid, the fuel pump control module sends a 40% duty cycle signal on the fuel pump monitor (FPM) circuit to report the concern to the PCM. The test fails when the fuel pump control module is still reporting that it is receiving an invalid duty cycle or frequency from the RCM after a calibrated amount of time.
Possible Causes:	ENS circuit open or short to ground ENS circuit short to voltage Radio frequency interference/electromagnetic interference (RFI/EMI) Damaged fuel pump control module Damaged RCM
Diagnostic Aids:	Check the harness for routing, alterations, incorrect shielding, or electrical interference from other systems. The ENS is used to notify the fuel pump control module of an event requiring the fuel pump to be disabled. This signal is used instead of an inertia fuel shutoff (IFS) switch. The fuel pump control module monitors the ENS signal by sending a 12V low current signal on the ENS circuit to the RCM.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
All	GO to PINPOINT TEST KC .

NOTE: 1: Install a new transaxle. Refer to the appropriate Automatic Transmission/Transaxle article.

NOTE: 2: Clear the transaxle control module (TCM) continuous DTCs. Carry out a TCM key ON engine OFF (KOEO) on demand self-test. If DTC P0A90 is present again, install a new transaxle. Refer to the appropriate Automatic Transmission/Transaxle article. If the DTC is not present, concern can not be duplicated or identified at this time. Go to PPT Z for intermittent diagnostics.

NOTE: 3: Check for damaged or seized engine. If the engine is OK, install a new transaxle. Refer to the appropriate Automatic Transmission/Transaxle article.

NOTE: 4: Clear the transaxle control module (TCM) continuous DTCs. Carry out a TCM key ON engine OFF (KOEO) on demand self-test. If DTC P0A92 is present again, check for damaged or seized engine, and install a new transaxle. Refer to the If the DTC is not present, concern can not be duplicated or identified at this time. Go to PPT Z for intermittent diagnostics.

NOTE: 5: DTC P1000 is ignored in the key on, engine off (KOEO) and key on, engine running (KOER) self-tests. Disregard DTC P1000 and continue as directed.