Diagnostic Aids
Turn ignition switch to RUN position, check for voltage transitions on SPI data line. If only history DTC U2001 is set, problem may be intermittent. Try to recreate fault by wiggling wiring and connectors while performing test.
Turn ignition switch to RUN position, check for voltage transitions on SPI data line. If only history DTC U2001 is set, problem may be intermittent. Try to recreate fault by wiggling wiring and connectors while performing test.