DTC 16

Code 16 Chart:

"Service Engine Soon" Light Wiring Diagram:

***UPDATED BY TSB # 92-6E-26 DATED NOVEMBER 1992




CIRCUIT DESCRIPTION:


The ECM monitors battery or system voltage on CKT 439 to terminal "BA6". If the ECM detects voltage above 16 volts for more than 10 seconds, it will turn the SES "ON" and set Code 16 in memory.

Code 16 will set if:

^ Engine running.

^ System voltage as monitored at the ECM terminal "BA6" over 16 volts.

^ Above conditions for 10 seconds or more.

TEST DESCRIPTION: Numbers below refer to circled numbers on the diagnostic chart.

1. Test generator output to determine proper operation of the voltage regulator. Run engine at moderate speed and measure voltage across the battery. If over 16 volts, repair generator.

DIAGNOSTIC AIDS:

^ An intermittent may be caused by a poor connection, rubbed through insulation, a wire broken inside the insulation or poor ECM grounds.

CHECK FOR:


^ Poor Connection or Damaged Harness. Inspect ECM harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wire connection and damaged harness.


^ Intermittent Test. If connections and harness checks OK, monitor battery voltage display while moving related connectors. If the failure is induced, the battery voltage will abruptly change. This may help to isolate the location of the malfunction.

NOTE: Charging battery with a battery charger and starting the engine may set a Code 16.


IMPORTANT: If ECM grounds and battery grounds are located on the same stud at transaxle, this could cause intermittent or improper sensor data to the ECM.