DTC P1493: AMBIENT/BTS V TOO LOW Jeep Cherokee II рестайлинг

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see CHEROKEE wiring diagram in WIRING DIAGRAMS article.

Note. DTC P1493: AMBIENT/BTS V TOO LOW is monitored with ignition DTC may be stored in Powertrain Control Module (PCM) if PCM senses voltage from Battery Temperature Sensor (BTS) less than .5 volt or more than 4.9 volts for 3 seconds. Possible causes are: defective BTS, defective PCM, defective connector or defective wiring.

1. Turn ignition on, with engine off. Using scan tool, read BTS voltage. If voltage is less than .5 volt, go to next step. If voltage is .5 volt or more, go to step 6).
2. Turn ignition off. Disconnect BTS connector. BTS is located under battery. Clean and/or repair connector as necessary. Turn ignition on, with engine off. Using scan tool, read BTS voltage. If voltage is 4 volts or less, go to next step. If voltage is more than 4 volts, replace BTS. Perform TEST VER-5A.
3. Turn ignition off. Ensure BTS connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance between ground and BTS connector, signal circuit (Pink/Yellow wire). If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair signal circuit for short to ground. Perform TEST VER-5A.
4. Turn ignition off. Ensure BTS and PCM connectors are still disconnected. Using an ohmmeter, check resistance between BTS connector, signal circuit (Pink/Yellow wire) and sensor ground circuit (Brown/Yellow wire). If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair signal circuit for short to sensor ground circuit. Perform TEST VER-5A.
5. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-5A.
6. Ensure ignition is on, with engine off. Using scan tool, read BTS voltage. If voltage is more than 4.9 volts, go to next step. If voltage is 4.9 volts or less, go to step 12).
7. Turn ignition off. Disconnect BTS connector. BTS is located under battery. Clean and/or repair connector as necessary. Connect a jumper wire between BTS connector, signal circuit (Pink/Yellow wire) and sensor ground circuit (Brown/Yellow wire). Turn ignition on, with engine off. Using scan tool, read BTS voltage. If voltage is one volt or more, go to next step. If voltage is less than one volt, replace BTS. Perform TEST VER-5A.
8. Turn ignition off. Ensure BTS connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connector as necessary. Turn ignition on, with engine off. Using an ohmmeter, check resistance of BTS sensor ground circuit (Brown/Yellow wire) between BTS connector and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open sensor ground circuit. Perform TEST VER-5A.
9. Turn ignition off. Ensure BTS connector is still disconnected. Ensure PCM connectors are still disconnected. Turn ignition on, with engine off. Using a voltmeter, check voltage on BTS connector, signal circuit (Pink/Yellow wire). If voltage is 6 volts or less, go to next step. If voltage is more than 6 volts, repair signal circuit for short to voltage. Perform TEST VER-5A.
10. Turn ignition off. Ensure BTS connector is still disconnected. Ensure PCM connectors are still disconnected. Using an ohmmeter, check resistance of BTS signal circuit (Pink/Yellow wire) between BTS connector and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open BTS signal circuit. Perform TEST VER-5A.
11. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-5A.
12. Turn ignition on, with engine off. Using scan tool, read and monitor BTS voltage while wiggling BTS connector and wiring harness. If sensor voltage changes, repair connector or wiring harness where wiggling caused voltage change. Perform TEST VER-5A. If sensor voltage does not change, go to next step.
13. Turn ignition off. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If connectors and wiring harness are okay, go to next step.
14. At this time, DTC P1493: AMBIENT/BTS V TOO LOW does not exist or is an intermittent problem. Using scan tool, read and record FREEZE FRAME data. Road test vehicle under conditions in FREEZE FRAME data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P1493: AMBIENT/BTS V TOO LOW returns, repeat test. If DTC P1493: AMBIENT/BTS V TOO LOW does not return, see INACTIVE DTC CONDITION. Test is complete.