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Scan Tool Unable To Communicate

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Perform this test when instructed during QUICK TEST  or if directed here by other test procedures. This test is used to diagnose the following:

Fig 1: Identifying Data Link Connector Circuits & Connector Terminals
G99H02658Courtesy of FORD MOTOR CO.
  1. This DTC indicates KOEO self-test cannot be completed. Ensure NGS tester is correctly attached to DLC. Ensure NGS tester is not damaged or defective. Verify correct procedure was used to activate continuous memory self-test, KOEO self-test or KOER self-test. Correct as necessary. If no faults are found, go to next step.
  2. If continuous memory codes are accessible, go to next step. If continuous memory codes are not accessible, go to step  6.
  3. If KOEO self-test can be activated, go to next step. If KOEO self-test cannot be activated, go to step  5.
  4. If KOER self-test can be activated, DTC is false. Obtain PCM part number and check manufacturer for correct PCM application. If KOER self-test cannot be activated, go to next step.
  5. Perform CONTINUOUS MEMORY SELF-TEST  under QUICK TEST. If any continuous memory codes are present, service DTCs as necessary before continuing. If unable to retrieve any continuous memory codes, go to next step.
  6. Inspect DLC for damage and repair as necessary. Turn ignition on. Measure voltage between terminal No. 16 (B+) at DLC and engine ground. See Fig 1. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open in B+ circuit.
  7. Turn ignition off. Measure resistance between terminal No. 4 (CHASSIS GROUND) at DLC and chassis ground. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in CHASSIS GROUND circuit.
  8. Turn ignition off. Measure resistance between terminal No. 5 (PWR GND) at DLC and negative battery terminal. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in PWR GND circuit to DLC.
  9. Turn ignition on. Using NGS tester, perform DATA LINK DIAGNOSTICS test. If PCM: NO RESPONSE/NOT EQUIPPED, PCM: NO RESPONSE CKT 914 (BUS-) or PCM: NO RESPONSE CKT 915 (BUS+) message is displayed, go to next step. If none of the specified messages are displayed, no problem is indicated at this time. Repeat QUICK TEST .
  10. If NGS tester displayed CKT 914=ALL MODULE NO RESP/NOT EQUIP or CKT 915=ALL MODULE NO RESP/NOT EQUIP message after performing DATA LINK DIAGNOSTICS test, proceed as follows:
    • If only CKT 914=ALL MODULE NO RESP/NOT EQUIP message is displayed, go to step  11.
    • If only CKT 915=ALL MODULE NO RESP/NOT EQUIP message is displayed, go to step  14.
    • If both CKT 914=ALL MODULE NO RESP/NOT EQUIP and CKT 915=ALL MODULE NO RESP/NOT EQUIP messages are displayed, repair open to BUS+ and BUS- circuits or repair short between BUS+ and BUS- circuits and all associated modules

    If NGS tester did not display CKT 914=ALL MODULE NO RESP/NOT EQUIP or CKT 915=ALL MODULE NO RESP/NOT EQUIP message after performing DATA LINK DIAGNOSTICS test, proceed as follows:

    • If CKT 914=SOME MODULE NO RESP/NOT EQUIP or PCM: NO RESPONSE ON CKT 914 (BUS+) message is displayed, go to step  13.
    • If CKT 915=SOME MODULE NO RESP/NOT EQUIP or PCM: NO RESPONSE ON CKT 915 (BUS-) message is displayed, go to step  16.

  11. Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Measure resistance between chassis ground and PCM connector terminal No. 16 (BUS+). If resistance is more than 50 ohms, go to next step. If resistance is 50 ohms or less, a short to ground in BUS(+) circuit or associated modules exists. See appropriate MODULE COMMUNICATIONS NETWORK article in ACCESSORIES & EQUIPMENT.
  12. Turn ignition on. Measure voltage between PCM connector terminal No. 16 (BUS+) and chassis ground. If voltage is one volt or less, go to next step. If voltage is more than one volt, a short to power in BUS(+) circuit or associated modules exists. See appropriate MODULE COMMUNICATIONS NETWORK article in ACCESSORIES & EQUIPMENT.
  13. Turn ignition off. Measure resistance of BUS(+) circuit between PCM connector terminal No. 16 and terminal No. 2 at DLC. See Fig 1. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in BUS(+) circuit to DLC.
  14. Ensure PCM is disconnected. Measure resistance between PCM connector terminal No. 15 and chassis ground. If resistance is more than 50 ohms, go to next step. If resistance is 50 ohms or less, a short to ground in BUS(-) circuit or associated modules exists. See appropriate MODULE COMMUNICATIONS NETWORK article in ACCESSORIES & EQUIPMENT.
  15. Turn ignition on. Measure voltage between PCM connector terminal No. 15 and chassis ground. If voltage is 6 volts or less, go to next step. If voltage is more than 6 volts, repair a short to power in BUS(-) circuit or associated modules exists. See appropriate MODULE COMMUNICATIONS NETWORK article in ACCESSORIES & EQUIPMENT.
  16. Turn ignition off. Measure resistance of BUS(-) circuit between PCM connector terminal No. 15 and terminal No. 10 at DLC. If resistance is less than 5 ohms, replace PCM. If resistance is 5 ohms or more, repair open in BUS(-) circuit to DLC.
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