The red Oil and Water Lamp (OWL) and the Engine Alarm Buzzer are intended to be turned on when conditions are present that will cause impending damage to the engine. The level of protection is dependent upon which Engine Warning and Protection System (EWPS) is turned on in the ECM. When the ignition switch is in the ON position, power is available at the OWL and alarm. The lamp and the alarm are turned ON when the ECM provides a path to ground. For the OWL / EWPS functions see Figure
“Oil Water Lamp / Engine Warning and Protection System Functions “
.
Figure 1. Oil Water Lamp / Engine Warning and Protection System Functions
Section 37.1.1
Fault Detection / Management
An open or short to ground can be detected in the OWL circuit during an On Demand Engine Standard Test by the technician. A momentary bulb check can also be visually observed each time the ignition switch is turned on by the operator. For the stop engine light and alarm see Figure
“Stop Engine Light and Alarm Wiring”
.
Figure 2. Stop Engine Light and Alarm Wiring
Key ON, Engine OFF voltage checks are listed in Table
“Key ON Engine OFF — Voltage Checks”
. Checks are made with the ECM chassis connector (black) unplugged, the breakout box installed, the ignition key ON and the engine OFF.
| Test Points | Spec | Comments |
| 439L to Grd | 12 volts | Fuse for instrument cluster and OWL lamp. |
| B to Grd | 12 volts | Battery voltage should be present from 439L to buzzer; if no voltage present, check circuit for open or short. |
| 54 to Grd | 12 volts | Battery voltage should be present from lamp circuit to ECM; if no voltage present, check circuit for open or short. |
Harness resistance checks are listed in Table
“Harness Resistance Checks”
. Checks are made with the ECM chassis connector (black) unplugged, the instrument cluster connector unplugged, and the ignition key OFF.
| Test Points | Spec | Comments |
| 54 to C | < 5 Ω | Continuity for ECM to Buzzer connector. |
| B to 439L | < 5 Ω | Continuity from Buzzer to fuse. |
Functional Checks:
- Physical Circuit Check — With breakout box installed momentarily ground the ECM chassis pin No. 54; the OWL lamp should illuminate if the OWL circuit is good.
- Output State Check — The OWL lamp can be commanded on for test purposes with the EST by requesting an Output State Check; if the OWL circuit checks out good to this point, and does not turn on when an Output State Check is commanded, either the ECM is bad or the feature is not turned on.
Fault Code Description:
Flash Code 263 = OWL Output Circuit Check Fault detected during a key ON, engine OFF, Standard Test; possible open or short in OWL.
Section 37.1.2
Engine Warning and Protection System Description
This group of parameters customizes the engine warning and protection (EWPS) feature. The EWPS safeguards the engine from undesirable operating conditions in order to prevent engine damage and to prolong engine life. When a warning condition is detected, the on-board electronics will light up the OWL and the warning buzzer is activated.
When a critical condition is detected, the on-board electronics will shut down the engine if the EWPS has the protection feature enabled. After an engine shutdown, the operator may start the engine again for a 30 second run time, if desired.
The event logging feature will also record when an excessive (i.e. critical) engine event has occurred in both engine hours and odometer readings. Currently there are four states of electronic operation.
- Standard
- Three–way Warning
- Three–Way Protection
- Two–Way Warning
Section 37.1.2.1
EWPS Mode
This parameter indicates to the on-board electronics the desired mode of operation for the engine warning and protection feature.
Section 37.1.2.2
Standard Warning (RPM)
Engine overspeed and engine overheat are provided as the default operating mode. No engine shutdown is available.
Section 37.1.2.3
Three-Way Warning (RPM, ECT, EOP, ECL)
Engine overspeed, engine overheat, engine oil pressure low, and loss of engine coolant are provided as the engine warning operating mode. No engine shutdown is available.
Section 37.1.2.4
Three-Way Protection (RPM, ECT, EOP, ECL)
Engine overspeed, engine overheat, engine oil pressure low, and loss of engine coolant are provided as the engine warning operating mode. Engine shutdown is available if an engine critical condition is detected. Critical engine conditions include overheat, low oil pressure and low coolant level.
Section 37.1.2.5
Two-Way Warning (RPM, ECT, EOP)
Engine overspeed, engine overheat, and engine oil pressure low, are provided as the engine warning operating mode. No engine shutdown is available.
Section 37.1.2.6
ECT Warning Temperature
This parameter indicates when an engine overheat condition warrants the OWL to be illuminated and the warning buzzer to be activated.
Section 37.1.2.7
ECT Critical Temperature
This parameter indicates when an engine overheat condition warrants an engine shutdown. The event logging feature will log when this event has occurred in both engine hours and odometer readings.
Section 37.1.2.8
EOP RPM Boundary 1
This parameter indicates the RPM range for which engine oil pressure level 1 is to be used for the loss of engine oil pressure detection.
Section 37.1.2.9
EOP RPM Boundary 2
This parameter indicates the RPM range for which engine oil pressure level 2 is to be used for the loss of engine oil pressure detection.
Section 37.1.2.10
EOP RPM Boundary 3
This parameter indicates the RPM range for which engine oil pressure level 13 is to be used for the loss of engine oil pressure detection.
Section 37.1.2.11
EOP Warning Level 1
This parameter indicates when a loss of engine oil pressure condition warrants the OWL to be illuminated and the warning buzzer to be activated.
Section 37.1.2.12
EOP Warning Level 2
This parameter indicates when a loss of engine oil pressure condition warrants the OWL to be illuminated and the warning buzzer to be activated.
Section 37.1.2.13
EOP Warning Level 3
This parameter indicates when a loss of engine oil pressure condition warrants the OWL to be illuminated and the warning buzzer to be activated.
Section 37.1.2.14
EOP Critical Level 1
This parameter indicates when a loss of engine oil pressure condition warrants an engine shutdown. The event logging feature will log when this event has occurred, in both engine hours and odometer readings.
Section 37.1.2.15
EOP Critical Level 2
This parameter indicates when a loss of engine oil pressure condition warrants an engine shutdown. The event logging feature will log when this event has occurred, in both engine hours and odometer readings.
Section 37.1.2.16
EOP Critical Level 3
This parameter indicates when a loss of engine oil pressure condition warrants an engine shutdown. The event logging feature will log when this event has occurred, in both engine hours and odometer readings.
Section 37.1.3
ECM Diagnostics
The following flash code could set when troubleshooting the OWL:
Section 37.1.3.1
Flash Code 263
ATA Code SID FMI 11
Oil Water Lamp OCC Fault.
The Output Circuit Test, performed during an On Demand Engine Standard Test, will test the OWL circuit for an open or short condition. If an out of range condition exists, a Flash Code 263 will be set.
| Series 40E Troubleshooting Manual – 6SE241 |
| Generated on 10-13-2008 |