Diagnostic Readout: Notes

Connect Bosch Tester (KDJE-P600 ) to CIS-E diagnostic connector. All on-off ratio values are to be checked with engine running at idle speed and operating temperature.

Fig 1: View of Bosch CIS-E Diagnostic Tester

The fixed on-off ratio indicates a possible malfunction. The TROUBLE SHOOTING and DIAGNOSTIC TESTING sections will help in diagnosing problems with the CIS-E fuel injection system. If a problem cannot be solved using these sections, see COMPONENT TESTING in this article.

NOTE: Some early 1986 production vehicles may not be equipped with the On-Board Diagnostic Readout System. Vehicles with CIS-E control units with manufacturing codes from 548 and later have built-in diagnostic readout system. Reading "0"

Check CIS-E control unit for voltage. Check wire to diagnostic socket, terminal No. 3 or on-off ratio tester for being defective. Check oxygen sensor signal. If voltage is 12 volts, see TEST 1 in DIAGNOSTIC TESTING section.