Description of PID 168 — Battery Voltage Outside Normal Operating Range
PID 168 indicates that the PLD-MR control unit has detected engine battery voltage outside the normal operating range.
The diagnostic condition is typically:
- Battery Voltage High (168 03)
- Battery Voltage Low (168 04)
Power Supply
The voltage supply for the PLD-MR is listed in Table “PLD-MR Voltage Supply” .
| Voltage Supply | Voltage | |
| 24 V | 12 V | |
| Nominal Voltage | 22 V ≤ V ≤ 30 V | 11 V ≤ V ≤ 16 V |
| Low Voltage | 8 V ≤ V ≤ 22 V
Limited Operating Range |
6.5 V ≤ V ≤ 11 V
Limited Operating Range |
| Overload Switch-Off | V > 33 V | V > 33 V |
See Figure “PLD-MR Connectors” for the connectors to the PLD-MR.
Figure 1. PLD-MR Connectors
The wiring for the VIH 16-pin connector to the PLD-MR is listed in Table “16-Pin Connector to the PLD-MR” . The side of the connector shown is looking into the pins.
| Pin | Signal Type | Function | Connector |
| 1 | Data Link | CAN Interface (High Line) |
 Front Looking into the Pins on the Harness |
| 2 | Data Link | CAN Interface (Low Line) | |
| 3 | Data Link | CAN HF Ground | |
| 4 | Data Link | CAN HF Ground | |
| 5 | Power Supply | Battery Voltage (+) | |
| 6 | Power Supply | Battery Voltage (+) | |
| 7 | NC | NC | |
| 8 | Digital Output | Starter Control Signal | |
| 9 | Ground | Battery Ground (-) | |
| 10 | Digital Output | Proportional Valve 1 – 4 High Side Supply | |
| 11 | Ground | Battery Ground (-) | |
| 12 | Digital Output | Starter High Side Control | |
| 13 | Digital Data Link | Diagnostic Link K-Line (ISO) | |
| 14 | Digital Output | Proportional Valve 3 Low Side Control | |
| 15 | Ignition Input | Ignition | |
| 16 | Digital Output | Proportional Valve 4 Low Side Control |
VIH Power Wiring
The OEM-supplied VIH power wiring (see Figure “Power Wiring” ) supplies 12 volts to the DDEC-VCU and PLD-MR. The terminals are designed to accept 14 AWG standard wire size.
Figure 2. Power Wiring
