Check Vpod Wiring - Detroit Diesel Series 60 EGR Technician Manual

DDEC IV TESTING

Check VPOD Wiring

The following checks should be performed for the VPOD wiring.
NOTE:
VPOD power should have been verified under the part number check. If not, refer to the
"Check Variable Output Pressure Device part number and Supply Voltage" section.
1. Turn ignition switch ON.
2. Unplug the VPOD mating connector.
3. Insert a 1,000 ohm resistor between cavities #2 and #1 for the +12V version, or cavities
#2 and #3 for the +24V version.
4. Connect a VOM to the VPOD connector between pin #2 and pin #3 for the 12V VPOD
or pin #2 and pin #1 for the 24V VPOD.
5. Using DDDL or a DDR, activate the PWM #2 (EGR Valve) and PWM #4 (VNT), and
ensure:
[a] Activating 11% duty cycle: VDC = 90% of the VPOD supply voltage ± 1 volt (e.g.,
voltage to VPOD = 13.8V * 0.9 = 12.42V; therefore 11.42V to 13.42V at PWM
is acceptable).
[b] Activating 90% duty cycle: VDC = 10% of the VPOD supply voltage ± 1 volt.
(e.g., voltage to VPOD = 13.8V * 0.1 = 1.38V, therefore 0.38V to 2.38V at PWM
is acceptable.)
6. Note any air leakage when PWMs are activated to 90% and correct the leaks as needed.
[a] If both of the PWM voltage measurements are correct, replace the VPOD that had the
wrong pressure reading.
[b] If the PWM voltage measurements are incorrect, and the wiring checks are okay, try
a test ECM programmed for EGR, or contact the DDC Customer Support Center
at 313-592-5800.
5-12
All information subject to change without notice. (Rev. June 2005)
7SE60 0506 Copyright © 2005 DETROIT DIESEL CORPORATION