TROUBLESHOOTING FLASH CODE 16
Signal Short to Ignition Check
Perform the following steps to check for a signal short to ignition.
1. Disconnect the vehicle harness connector at the ECM.
2. Remove the jumper wire at the CLS harness connector.
3. Turn ignition ON.
4. Measure voltage at cavity A (#115 signal) of the CLS connector and battery ground.
See Figure 16-2.
[a] If the voltage measurement is less than or equal to 6 volts, refer to section 16.3.5.
[b] If the voltage measurement is greater than 6 volts, the CLS signal line (#115)
is shorted to the 12/24 volt DC line. Repair the short or replace the #115 wire.
Refer to section 16.3.7.
Coolant Level Sensor and Circuits
ECM Connectors Check
Perform the following steps to check the ECM connectors.
1. Inspect terminals at the vehicle harness connector (both the sensor and harness side) for
bent, corroded and unseated pins or sockets. Check terminal and pin H3 at the ECM and
all terminals and pins in the CLS connector. See Figure 16-3.
[a] If terminals and connectors are not damaged, replace the CLS. Refer to section 16.3.7.
If this is a repeated failure of the CLS, refer to section 16.3.6.
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION