Diagnostic Aids
With ignition switch in RUN position, check for voltage transitions on SPI data line. If only history DTC U2004 is set, problem may be intermittent. Try to recreate fault by wiggling wiring and connectors while performing test.
With ignition switch in RUN position, check for voltage transitions on SPI data line. If only history DTC U2004 is set, problem may be intermittent. Try to recreate fault by wiggling wiring and connectors while performing test.